Tag Archives: disease

July 5, 2023

Hop Latent Viroid (HLVd) & Pathogen Diagnostics: A Comprehensive Overview

By Tassa Saldi, Ph.D.

Hop latent viroid (HLVd) has gained attention as the molecular cause of “dudding disease” and is causing significant economic losses in the cannabis industry.^1,2 Estimates indicate that upwards of 4 billion dollars of market value are lost each year to this pathogen alone.³ The impact of HLVd on cannabis plants necessitates the development and implementation of effective pathogen diagnostics to mitigate its spread and minimize crop damage. With collaborative research efforts, we can gain valuable insights into the characteristics, spread, symptoms and preventive measures associated with HLVd in the cannabis industry.

Viroids: A Brief Overview

Viroids are unique infectious agents composed solely of genetic material, distinct from viruses. Unlike viruses, viroids lack a protective protein layer and solely rely on the host plant for replication and spread. Their stability and ability to persist in various environments make viroids a formidable threat to plant health.

Hop Latent Viroid: Origin and Global Spread

Hop latent viroid was initially identified in hop plants in 1988⁴ and was found to be largely asymptomatic in this crop. Consequently, HLVd has spread worldwide, mostly unchecked by the hops industry. This pathogen has been identified on most continents and in some fields more than 90% of hops plants are infected.⁵ Hop latent viroid very likely jumped from hops into cannabis, due to similar genetics. The timing and mechanism of cross-species transmission to cannabis remains unknown, but the prevalence of HLVd suggests this viroid has been circulating within cannabis for an extended period. Data collected at TUMI Genomics indicates that HLVd is present in all states in the United States where cannabis is legal as well internationally including; Canada, the United Kingdom, France, the Netherlands, Thailand, Austria and Switzerland.

Symptoms and Impacts on Cannabis Plants

HLVd exhibits a wide range of symptoms, which can vary from severe to subtle, affecting the growth, leaf development, flower quality and overall vitality of cannabis plants. Understanding these symptoms is crucial for timely diagnosis and appropriate disease management strategies. However, HLVd can also present asymptomatically, especially in vegetative plants. The only way to determine if your plants are infected is by routine molecular testing.

Modes of Transmission

Mechanical Transmission: HLVd primarily spreads mechanically through contact with infected sap during activities like trimming and handling. Additionally, transmission through contaminated water and the potential role of insects, fungal pathogens and seeds in spreading HLVd have also been observed.

Seed Transmission: Although no published studies exist in cannabis describing the frequency of seed transmission, HLVd does transmit through seeds in hop plants at a rate of around 8%.⁷ Preliminary studies performed by TUMI Genomics in collaboration with EZ-genetics suggest cannabis seed transmission does occur at variable rates depending on strain and level of infection of the parent plants.

Water Transmission: It has also been observed that viroids are in high concentration in the roots⁸ and can move from the root into runoff water.⁹ Plants sharing a common water source with infected plants, such as recirculating water systems or flood and drain procedures, are at risk for transmission of the viroid.

Insect and Other Vector Transmission: The jury is still out as to whether or not insects can transmit HLVd. However, multiple viroids are transmitted via insects, so it is likely that HLVd insect transmission occurs. Recent studies also indicate that fungal pathogens, like Fusarium, can transmit viroid infections.⁶ While pathogenic fungus is a major concern for cannabis growers in its own right, limiting the prevalence and spread of fungal pathogens in your facility could help limit hop latent viroid transmission as well.

Therefore, implementing proper sanitation practices and limiting pest access can help minimize transmission risks.

Preventive Measures

Prevention plays a vital role in safeguarding cannabis crops against HLVd. The STOP program, developed by TUMI Genomics, offers a comprehensive approach that includes maintaining a Sterile environment, Testing mother plants regularly, Organizing the facility to minimize pathogen spread, and Protecting the facility’s borders from introduction of infected plant material, insects and contaminated water. More details on these preventative measures can be found here.

Pathogen Diagnostics

Protecting your plants from hop latent viroid requires accurate identification and removal of infected plants before the infection spreads to other plants. To accomplish this, several critical factors should be considered:

Type of test: HLVd and all viroids can only be detected by a molecular test (a test that detects the presence of DNA/RNA). Among common molecular tests, PCR is generally the most sensitive and accurate method. PCR can provide both a diagnosis and an approximate viroid level, allowing informed management decisions. Other types of molecular tests, such as LAMP and RPA, can formally be as sensitive as PCR, but the classic versions of these assays often suffer from false positive/negative results, reducing accuracy.

Tissue type: An important consideration for HLVd detection is the plant tissue selected for testing, especially when identifying low-level or early infections when HLVd is not yet systemic. Studies completed by TUMI Genomics and others show root tissue contains the highest levels of HLVd and is the most reliable tissue for detection of viroid infection. While upper root tissue appears to contain the highest levels of viroid, roots from anywhere in the root ball are predictive of infection. Samples taken from the leaves/foliage tend to have lower levels of viroid and may produce false negative results.

Testing frequency: Routine pathogen testing is standard practice in general agriculture and is critical to maintain a healthy cannabis crop. Testing of mother plants every 4-6 weeks for economically critical pathogens (such as HLVd) will help ensure a successful run and a high-quality product.

Disinfection Methods

Studies have shown that viroids can remain infectious for longer than 24 hours on most common surfaces¹¹ and 7 weeks in water.¹⁰ Making effective disinfection methods essential to limit the spread of HLVd. While common disinfectants like alcohol and hydrogen peroxide are ineffective against viroids, a 10% bleach solution has shown efficacy in destroying HLVd. Proper tool sterilization practices, such as soaking tools in bleach for 60 seconds, are crucial to prevent transmission during plant handling.

Hop latent viroid poses a significant threat to the cannabis industry, leading to substantial economic losses. Timely and accurate pathogen diagnostics, along with stringent preventive measures, are essential for minimizing the impact of HLVd. Regular testing, proper disinfection protocols and adherence to pathogen prevention programs can help ensure the health and vitality of cannabis crops in the face of this global pandemic.

References

Bektas, A., et al. “Occurrence of Hop Latent Viroid in Cannabis Sativa with Symptoms of Cannabis Stunting Disease in California.” APS Journals, 21 Aug. 2019, doi.org/10.1094/PDIS-03-19-0459-PDN.
Warren, J.G., et al. “Occurrence of Hop Latent Viroid Causing Disease in Cannabis Sativa in California.” APS Journals, 21 Aug. 2019, doi.org/10.1094/PDIS-03-19-0530-PDN.
Cooper, Benjie. “Hop Latent Viroid Causes $4 Billion Cannabis Industry Loss – Candid Chronicle.” Candid Chronicle – Truthful, Straightforward, Blunt Cannabis News, 16 Aug. 2021, candidchronicle.com/hop-latent-viroid-causes-4-billion-cannabis-industry-loss/.
Puchta H, Ramm K, Sänger HL. The molecular structure of hop latent viroid (HLV), a new viroid occurring worldwide in hops. Nucleic Acids Res. 1988 May 25;16(10):4197-216. doi: 10.1093/nar/16.10.4197. PMID: 2454454; PMCID: PMC336624.
Faggioli, Franceso, et al. “Geographical Distribution of Viroids in Europe.” Viroids and Satellites, 31 July 2017, www.sciencedirect.com/science/article/abs/pii/B9780128014981000449#bib47.
Wei S, Bian R, Andika IB, Niu E, Liu Q, Kondo H, Yang L, Zhou H, Pang T, Lian Z, Liu X, Wu Y, Sun L. Symptomatic plant viroid infections in phytopathogenic fungi. Proc Natl Acad Sci U S A. 2019 Jun 25;116(26):13042-13050. doi: 10.1073/pnas.1900762116. Epub 2019 Jun 10. PMID: 31182602; PMCID: PMC6600922.
Singh RP. The discovery and eradication of potato spindle tuber viroid in Canada. Virus disease. 2014 Dec;25(4):415-24. doi: 10.1007/s13337-014-0225-9. Epub 2014 Dec 2. PMID: 25674616; PMCID: PMC4262315.
Jama, Aisha, et al. TUMI Genomics, Fort Collins, CO, 2022, Hop Latent Viroid Levels and Distribution in Cannabis Plant Tissue.
Mackie AE, Coutts BA, Barbetti MJ, Rodoni BC, McKirdy SJ, Jones RAC. Potato spindle tuber viroid: Stability on Common Surfaces and Inactivation With Disinfectants. Plant Dis. 2015 Jun;99(6):770-775. doi: 10.1094/PDIS-09-14-0929-RE. Epub 2015 May 15. PMID: 30699527.
Mackie AE, Coutts BA, Barbetti MJ, Rodoni BC, McKirdy SJ, Jones RAC. Potato spindle tuber viroid: Stability on Common Surfaces and Inactivation With Disinfectants. Plant Dis. 2015 Jun;99(6):770-775. doi: 10.1094/PDIS-09-14-0929-RE. Epub 2015 May 15. PMID: 30699527.
Mackie AE, Coutts BA, Barbetti MJ, Rodoni BC, McKirdy SJ, Jones RAC. Potato spindle tuber viroid: Stability on Common Surfaces and Inactivation With Disinfectants. Plant Dis. 2015 Jun;99(6):770-775. doi: 10.1094/PDIS-09-14-0929-RE. Epub 2015 May 15. PMID: 30699527.

January 30, 2023

3 Benefits of Conducting Genetic Tests on Your Plants

By Angel Fernandez

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Many growers may wonder why it’s important to get their plants genetically tested, but the truth is that genetic testing can make growing a lot easier. Genetic analysis in plants can give a wide range of results that can help scientists solve everyday problems in plant cultivation, such as detecting diseases and identifying important traits in plant species.

Currently, three of the most important benefits that genetic testing can give growers are the ability to detect diseases, identify the gender of their plants and control the quality of their crops.

Pathogen detection

Pathogen infections can be difficult to detect and by the time symptoms are obvious, it may be too late and the rest of the crop is already contaminated. This is why DNA tests are a valuable tool for the early detection of diseases in plants. Even though plants reproduce through cloning, it’s crucial to make sure the mother plant is healthy before proceeding, as 100% of the genetic material will be transferred to the clone, including any diseases the mother plant may have, such as a virus.

There are a few ways to detect pathogens in plants, including detection and symptomatology, serological techniques for viruses and microbiological techniques for fungi and bacteria. However, another effective method is detection tests using genetic material, also known as molecular methods. These tests involve screening the plant’s genetic material for any alterations, such as the presence of the pathogen’s genetic material. These tests are particularly useful as they provide accurate results when at least part of the pathogen’s genome sequence is known. This is important as many of these genomes have yet to be fully studied and there may be new unknown variants.

Tobacco Mosaic Virus symptoms can include tip curling, blotching of leaf mosaic patterning, and stunting

The reliability and effectiveness of genetic and molecular tests are due to the use of DNA as the starting material for pathogen detection. DNA is a stable molecule that can withstand adverse conditions, such as high temperatures or low humidity. Additionally, this technique can still be effective even when the samples used are very damaged or necrotic. Due to these qualities, genetic testing is considered one of the best methods for pathogen detection.

In summary, genetic testing is the most effective technique for pathogen detection as it is highly specific, requires a small sample and provides accurate results in a short period of time.

Plant gender detection

In the case of the cannabis plant, it is naturally diploid and dioecious, meaning that it has separate male and female reproductive structures, and each one contributes a chromosome during reproduction. However, there may be mutations that result in hermaphrodite plants, which have both male and female reproductive structures.

Growers who propagate their crops through seeds must wait several weeks to identify the sex of their plants, as their dioecious nature makes it difficult to recognize the plant’s sex in the early stages of growth. This can be time-consuming and resource-intensive. However, thanks to genetic testing, it is possible to determine the sex of a plant long before it reaches the flowering stage.

The sex organs on a Cannabis plant identified.

The determination of the gender of a dioecious plant is influenced by a sex chromosome system. Male plants have an XY sex chromosome system, known as heterogametic, while female plants have the XX sex chromosome system, known as homogametic.

To identify the sex of a plant through genetic studies, DNA or RNA-based molecular markers are used with a tissue sample. These markers typically look for the male trait “Y” in the plant, as the trait “X” is present in both male and female plants. In this way, the presence of the Y chromosome can be used to confirm the plant is male, and its absence can be used to confirm that it is female.

Crop quality control

The same species can often present one or more varieties, and although they may have physical features that distinguish them, it is not always possible to identify them with the naked eye. Beyond physical characteristics, genetic traits can have considerable differences.

Molecular identification is a very accurate tool for identifying varieties

Different varieties of cannabis have been widely cultivated and crossbred, making it possible for plants to have very similar physical traits, making it difficult to identify the variety being cultivated. This is why molecular identification is a very accurate tool for identifying varieties in cases where there is uncertainty about their identity.

Additionally, some plants can produce lower or higher amounts of cannabinoids due to their genetic nature or small mutations that occurred during growth. This is how there are plants with the advantage of having genes that code for high production of THC or CBD. These outstanding traits can be detected through the selection of characteristics using analysis of molecular markers that indicate the presence of these genes in the plant, or that detect the genes responsible for synthesizing these substances and determine their respective quality.

These procedures are performed using a tissue sample from the plant and using DNA as a starting material for testing, which provides information on the genetic traits of interest and validates their function.

December 13, 2022

The 3-Legged Stool of Successful Grow Operations: Climate, Cultivation & Genetics – Part 5

By Phil Gibson

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This is Part 5 in The 3-Legged Stool of Successful Grow Operations series. Click here to see Part 1, here to see Part 2, here to see Part 3, and here to see part 4. Stay tuned for the final piece in the series, Part 6, coming in the new year.

Genetics

With climate and cultivation methods explored, today, we cover the third leg in the primary stool, genetics. Some would say good genetics is all that you need and anyone can be successful with good genetics. We all know that this is not experience talking. Things can go wrong, even with great genetics. Here are some inputs how to pick great genetics so you have them on your side.

Hybrids & Strains

Seeds, the beginning of genetic performance

Everything successful cultivators grow is aligned to their consumer audience. This is hard to predict as the desires in your market will migrate over time as one variety will be highly popular and poof, it’s not, so constant change is necessary. Finding the right flower at the right time is the trick.

The first thing to decide in your pursuit of the ideal phenotype (or pheno-hunt) are your target customers. Assuming you’ve made the choice to go “top-shelf” for aeroponic or hydroponic flower, your variety selection comes down to filial breeder seeds or stable strains from suppliers you know.

Filial hybrids are developed by professional breeders. Two distinct inbred strains are repetitively crossed until their traits are highly consistent. At this point, these carefully inbred lines are crossed to selectively mix the two well defined sets of traits. Filial hybrids are stable and you can usually rely on the robust nature of these seeds.

Strains, on the other hand, are the cross of two strains but they may not be inbred stable filial strains. Sometimes this results in something amazing, but just as randomly, the traits can morph into something disappointing.

Our advice here is to pay the premium and start with high quality reliable stock.

Uniformity

Consistency? Will you grow one variety or multiple varieties per room and per harvest; will they grow well together? Do they grow and test out in a consistent manner (plant size, color, bud size & yield, tested terpene profiles, aroma, disease resistance or tolerance). Are you growing for top shelf flower or bulk extraction? I will focus this discussion on top shelf flower. Premium seeds from professional filial hybrids are not a guarantee, but they are designed to be stable and consistent in their growth and results targeting high performance.

High cannabinoids: 420Kingdom Grapes & Cream

Here, experience counts and reliable seed vendors tend to be well established with filial lines that are worth the investment. Once you acquire your genetics, how to leverage that investment?

Killer Genetics

What traits does your consumer want? Initial searches usually target THC or CBD levels and they evolve to special terpene profiles or pleasing aromas. Flower or bud shape, color, size, density, and stickiness are also traits that can differentiate your genetics. As a producer, you also want to target yield including tall or stretching genetics, or short and fast flowering, germination rates (sometimes they don’t) and percentage of likely hermaphroditing (seldom zero). The qualitative aspects (smoking characteristics) of your production flower that deliver a unique customer experience, both real and imagined, wrap up your brand experience.

So, as you can guess, one size does not fit all types of consumers. Very high yielders that are immediately targeted for extraction offer very different values than perhaps a smaller yielding very potent top shelf smokeable bud. It is a good strategy to plan for a handful of strains that you can bring to market so you have something that will hit the sweet-spot when you deliver your harvests.

Seeds

Seeds with documented guarantees from reliable sources eliminate the characteristic risk, and with the right testing reports, they guarantee no pathogens as well.

The challenge of seeds can be genetic variation, as discussed above, depending on the stability of the commercial breeder. This potential variance can lead to surprises and disappointment. Starting from seed also takes more time to germinate the seeds, exterminate the males, grow mother plants, take cuttings, and start the cycle. This can add 12-16 weeks to your go-green targets for your flower rooms. Be sure to integrate this cycle time planning into your production cycle.

Clones

Insourced clones are the fastest way to go green and move through veg to produce flowering plants and bud harvest. Clones are created by taking a branch cutting from a “mother” plant and typically “rooting” that cutting using an aeroponic cloning system. This clone process can take a few days or weeks depending on the grow environment and aeroponics process. A rooted clone maintains the genetic characteristics and phenotype of the mother plant.

The typical way smaller grow shops get started is through buying clones that are made from these rooted branch cuttings. The combination of mother plants, clones, and sometimes “veg” plants are gathered together in a “nursery”. Nurseries need to be stable for long periods of time to produce the veg growth necessary for cuttings. This time delay makes it harder for the nursery provider to keep the area sterile, without disease, and without pests. If the mothers carry a disease, they are likely to transfer that biologic over to the cuttings. If the media that the clones are grown in picks up root gnats, they will travel with the clones into your facility. The short answer is source your clones from professionally run operations. This trust is worth every penny.

Insourcing clones allows you to avoid the cost and complexity of running a “nursery”, but this also moves the pest management and quality of mother stock and clones outside of your control zone. In other words, you depend on the clone supplier for both healthy plants AND availability. No clone available from your supplier means no flower in your grow rooms. Your production revenue depends on the reliability of your clone supplier in many ways.

In some grow operations, the nursery is extended to cover the vegetative growth stage of cannabis plants or “veg.” In other approaches, a flower room is occupied for an additional week or two for veg growth. We at AEssenseGrows are strong advocates of running all cloning and vegging activity in a vertical aeroponic nursery in parallel to your flower rooms

Mothers, clone, and veg stages all grow with a vegetative growth light schedule (18 hours on, 6 hours off). The typical process is to take a cutting from a mother plant, place that in an aeroponic “cloner” for 10-12 days until a healthy set of roots is formed for the cutting. That clone is then typically pinched off at the top of the plant at which point the veg stage can begin. Light intensity is gradually increased and the plants are typically vegged for an additional 2 weeks, at this point, you have a bushy veg plant that is ready for a 12/12 light cycle and flowering.

In aeroponics, all of this is done in nursery space. If you choose to use soil or grow media approaches, a series of increasingly larger buckets or rockwool cubes are needed to manage the veg stage and the transition to flower. This can be done in a dedicated veg room or for the first week or two in the flower rooms

Tissue Culture

Another method for creating your young plants is tissue culture. This is the method of harvesting genetic material from an existing plant with desired characteristics. These genetic samples can be contamination free and even supplied by a genetic bank. A portion of these tissues are cultured in a gel grow tray and the plant will develop roots with a stalk that reaches upward for light energy.

These plant starts are hardened in a similar method to cloning and typically, these starts are grown into mothers that supply your cuttings for the clone cycle. This is an advanced method, so plan for research and development with expected delays to the front end of your sourcing cycle if you choose this path.

Strain Examples

Selecting the best genetics for your market is an art form. Many choices abound. High yielding dense classic strains are Blue Dream, Skittles, Sour Diesel and Girl Scout Cookies. Each of these deliver a typical 18%-24% THC content from fast growing, medium height high plants that yield dense buds. Very potent THC genetics that are popular currently are various “OG” genetics, Bruce Banner, various “Cake” genetics and Kush options. Variants of these run from 25% to 35% THC content.

This Chapter’s Hero Award

Every customer produces great results for their markets but we are very impressed by the genetic selections by 420Kingdom in the central valley of California. Jeffrey Thorn is the owner there and continues to impress with a range of high potency genetics that demand premium prices and sell out regularly in their highly competitive market.

With good genetics for your consumers, you are positioned to be successful. Advanced cultivation methods like aeroponics and hydroponics can give you a lift and the right environment and nutrition helps you tie this all together. Our next and last chapter will cover consistency and repeatability through Standard Operating Procedures (SOPs).

September 15, 2020

California Employment Laws, COVID-19 & Cannabis: How New Regulations Impact Cannabis Businesses

By Conor Dale

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As employers in the cannabis industry adapt to making their businesses run and thrive in the age of COVID-19, federal, state and local jurisdictions have issued new laws and regulations providing rules and guidance on returning employees to work. Employers in the industry should be aware of, and prepare for, these rules moving forward.

Federal guidance regarding COVID testing and employees’ return to the workplace:

Since March, the Equal Employment Opportunity Commission (EEOC) has issued guidance and frequently asked questions (FAQ) concerning employment-related COVID-19 topics. In its September update, the EEOC answered practical questions relating to COVID testing, questions to employees regarding COVID, and employee medical information.

Employee testing

The EEOC has already stated that employers may administer COVID-19 tests before initially permitting employees to enter the workplace. In its September FAQs, the EEOC confirms that employers may conduct periodic tests to ensure that employees are COVID free and do not pose a threat to coworkers and customers. The EEOC also clarified that employers administering regular COVID-19 tests is consistent with current Centers for Disease Control and Prevention (CDC) guidance and that following recommendations by the CDC or other public health authorities such as the Food and Drug Administration (FDA) regarding employee testing and screening is appropriate. The EEOC acknowledges that the CDC and FDA may revise their recommendations based on new information, and reminds employers to keep apprised of these updates.

COVID questions for employees

The EEOC also confirmed that employers may ask employees returning to the workplace if they have been tested for COVID-19, which, presumably, permits employers to ask if the employee’s test was positive or negative. Please note that an employer’s right to ask employees about COVID testing is based on the potential threat that infected employees could pose to others if they physically return to work. As a result, the EEOC clarified that asking employees who exclusively work remotely and/or do not physically interact with other employees or customers about potential COVID-19 status would not be appropriate. The EEOC also stated that an employer may not directly ask whether an employee’s family members have COVID-19 or symptoms associated with COVID-19. This is because the Genetic Information Nondiscrimination Act (GINA) generally prohibits employers from asking employees medical questions about family members. However, the EEOC clarified employers may ask employees if they have had contact with anyone diagnosed with COVID-19 or who may have symptoms associated with the disease.

Sharing information about employees with COVID

The Americans with Disabilities Act (ADA) requires employers to confidentially maintain information regarding employees’ medical condition. The EEOC’s updated FAQS clarify that managers who learn that an employee has COVID may report this information to appropriate individuals within their organization in order to comply with public health guidance, such as relaying this information to government contact tracing programs. Employers should consider directing managers on how, and to whom, to make such reports, and specifically instruct employees who have a need to know about the COVID status of their coworkers to maintain the confidentiality of that information. The EEOC also clarified that workers may report to managers about the COVID status of a coworker in the same workplace.

California state guidance on employees returning to work

The state of California also recently released a “COVID-19 Employer Playbook” which provides guidance on employees to return to work. That playbook states that employees with COVID related symptoms may return to work 24 hours after their last fever, without the use of fever-reducing medications, if there had been an improvement in symptoms and at least 10 days had passed since symptoms first appeared. This was also indicated in the California Department of Public Health (CDPH) Order, issued in June, about responding to COVID-19 in the Workplace.

More recently, on August 24^th, the CDPH released similar guidance which reiterates when employees who have tested positive for COVID could return to the workplace when: (1) at least 10 days have passed since symptoms first appeared; (2) at least 24 hours have passed with no fever (without the use of fever-reducing medications), and (3) their other symptoms have improved. Conversely, individuals who test positive for COVID and who never develop symptoms may return to work or school 10 days after the date of their first positive test.

Employers should also check local public health orders for their county when determining how and when to return an employee who has recovered from COVID-19. It is important to also confer with your employment counsel when implementing new policies and procedures related to COVID-19, particularly given that the guidance issued by government authorities continues to evolve at a rapid pace.

Return to work laws on the horizon

Finally, a number of local governments in California such as the City of San Francisco, Oakland and Los Angeles have enacted return-to-work ordinances generally requiring employers to offer available positions to former employees who have been separated from employment due to coronavirus related business slowdowns or government-issued shutdown orders. The California legislature is also in the process of enacting a potential law that would similarly require employers in the state to offer vacant job positions to former employees whose employment ended due to COVID.

While the San Francisco ordinance only addresses positions in San Francisco and the Oakland and Los Angeles ordinances primarily address large employers in the hospitality and restaurant industries, cannabis industry employers should strongly consider offering vacant job positions to former employees whose employment ended due to COVID in order to comply with these ordinances and other potentially applicable future laws and in an effort to avoid potential legal claims from former employees.

Employers are strongly advised to consult with counsel to make sure they are following the requirements of these new laws and regulations.

March 25, 2020

Soapbox

Clean Grow Still Failing? Check for Endophytic Mold

By Bernie Lorenz, PhD

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The journal Frontiers in Plant Science recently shared an important article from researchers at Simon Fraser University in British Columbia, highlighting the “Pathogens and Molds Affecting Production and Quality of Cannabis Sativa.”

As a chemist focused on the science of preventing and mitigating mold in greenhouse and indoor cannabis grow facilities, this piece was fascinating to me. Like many others, it details and explains prevalent mold like Penicillium, Cladosporium and Aspergillus – things I see in grows every day.

But wait, there’s more fungi

The research and resulting article also brought up another type of fungi – endophytic mold. Endophytic mold usually lives symbiotically with plants, or is at least beneficial for both plant and fungi.

But not always.

In the past, the industry has believed that damaging mold spores were found on the outside of the flower. When moved, that flower would release the spores and send them flying – often creating massive cross-contamination issues for indoor grows.

“While cannabis is an incredibly powerful plant in terms of its medicinal properties, it is unfortunately highly susceptible to many pest and pathogens,” says Hope Jones, PhD, CEO, Adivina & ECS. “And it is this susceptibility that is so challenging to many inexperienced or undisciplined grow operations.”

Now, however, we know that there’s another culprit to add to the list: the inner parts of the plant can also be a source of endophytic cross contamination and mold.

Since it grows inside of the plant, this fungus creates high spore counts that can cross contaminate from outside, into the flower.

Treating mold in a facility

Here’s the good news:

This seemingly bad news – that there’s a new fungus to worry about, and it is inside the flower – may actually help cannabis grows struggling with mold, and those who are following the proper protocols already.

A petri dish of mold growth from tested cannabis Photo credit: Steep Hill

Effective mitigation protocols can include things like treating HVAC systems, controlling humidity, using products like chlorine dioxide to treat irrigation lines, enforcing protective clothing and shoe covers for employees, reducing the amount of in-and-out for employees around grow rooms.

These are important upstream and environmentally-focused integrated pest management (IPM) programs that will usually keep facilities clean and relatively mold-free.

But if these programs are in place, and there’s still an issue, Endophytic fungi may be to blame.

If you are having ongoing mold issues but have ruled out cross-contamination and a facility without proper protocol, look to the mother plant.

“Small mistakes in agricultural practices are amplified with cannabis,” Dr. Jones continues. “And today’s propagation practices of traditional cloning add to this vulnerability. Cannabis is an annual plant and by keeping mothers in a perpetual state of vegetative growth for years, and taking repetitive cuttings produces clones in a highly stressed state. This stressed state diminishes genetic potential and weakens a plant’s ability to fight disease and pests.”

Testing for and addressing endophytic fungi

If these concerns are ringing a bell, remember, there is also a way to test for Endophytic mold.

Checking cuttings from suspected mother plants over a period of time is the best way to see if the Endophytic mold is present.

A section of the mother plant cutting is placed into a solution (for example, as outlined by the article, a very concentrated hypochlorite followed by 70% Ethanol) that will kill all of the microorganisms that are present on the surface of the plant tissues.

A large tissue culture facility run in the Sacramento area that produces millions of nut and fruit trees clones a year.

From there, an unadulterated dissection of the internal tissues can be extracted and cultured for quantification and identification of endophytic fungi.

“Tissue culture offers a form of genetic rebooting returning the plant to its natural genetic potential and thereby strengthening its natural ability to defend against environment assault,” says Dr. Jones. “It also allows the breeder to conduct pathogenic disease testing which provides the entire industry with a higher level of scientific certainty and analysis.”

If you find this mold inside of the mother plant, your facility’s mold problem could be a systemic issue, not an environmental one.

If you do find that Endophytic mold is causing issues, of course, you may have to destroy the mother plant.

This should not mean the end of a strain. Tissue culture on a cutting is an option that can eliminate the unwanted fungi and save the genetics. Using those genetics to regrow a mother will start fresh and avoid the intrinsic mold that was plaguing the strain prior.

Growing knowledge

The practice of checking mother plants for Endophytic mold is not yet commonplace in cannabis, but the hemp business is leading the way.

They’re testing to create very clean plants, so you don’t have issues during cultivation.

Major growers in the U.S. could save millions in lost harvests with mold mitigation. If your current IPM program isn’t doing the trick, you may want to follow in hemp’s footsteps and look inside the plant.

March 16, 2020

How Coronavirus is Affecting the International Cannabis Industry

By Marguerite Arnold

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Frankfurt: Germany right now is not the worst place to be as a global pandemic closes borders and leads predictably to mass change overnight, which is unparalleled during peacetime. But it is still eerie. Berlin and Cologne are starting to close public spaces (like restaurants, bars and clubs).

The grocery stores and pharmacies are still stocked and open however- it is a national priority.

On Germany’s borders, Europe is closing in a way it has not since WWII. The EU is considering banning all non EU “foreigners” from entering the region for nonessential reasons for the next 30 days – albeit in an environment where leaders are also concerned about making sure supplies get through to those who need them.

It also feels like wartime – only this time the “enemy” is a virus. It is called COVID-19, and it is spreading. It cannot be “stopped” although authorities are now doing everything they can to slow it down. At risk are not only populations but also vulnerable health care systems. The goal here is to prevent masses of sick people showing up at hospital. There will not be enough space for everyone if the rapid spread of the virus is not stopped, starting with beds and ventilators. In Italy, doctors are already triaging patients (deciding, in an overwhelming influx of sick patients, who has a chance of living and who does not), because there is a shortage of staff, beds and medical devices for those who need the most care.

The German government, in particular, is clearly prioritizing slowing down the spread and mitigating the load on a system that is strong, but also vulnerable to this kind of existential overload. Jens Spahn, Germany’s health minister, sounded the alarm early about mass gatherings. The country’s Chancellor, Angela Merkel, has promised to throw “Germany’s arsenal” (funding) to help German organizations hit hardest.

But that is just one country. Italy is in lockdown, Spain is on its way this week, and many others are closing borders. In Switzerland, as of this weekend, the only shops that were open were pharmacies and grocery stores. To get in, you must wait in line outside, spaced 1 meter from other people, and use hand sanitizer as you enter.

These are not privations that any generation alive today remembers viscerally. The closest is stories, perhaps second or third hand, of what life was like here during wartime.

Both China and now Germany have sent medical supplies to Italy (the worst affected country in Europe so far), and a German company is on the front lines of producing a vaccine which is likely to be ready for human trials as of June.

What Is The Impact On The Cannabis Industry Specifically?

But how does all of this impact the global cannabis industry, especially as it is an industry still very much and by design, built on international imports? Throughout the world, including the United States, cannabis-related trade shows, expos and conferences are all being either cancelled or rescheduled to June at the earliest. President Trump also instituted a European travel ban, although this will not have much effect on the industry here, since Germany imports cannabis from Canada, not the U.S. for its medical market.

The connection to the industry from the threat of the virus itself is also on display. In Illinois, for example, some dispensaries are giving priority to their medical patients, shutting the doors to recreational customers. Just months after legalizing recreational sales, the state is now telling dispensaries to discourage crowds and prevent customers from lining up. That is not so far the case in Europe where cannabis is slowly being normalized into the regular pharmacy system. But pharmacies are also on the front lines of this epidemic – not only in that they serve front-line customers, but also deliver medicines to retirement homes.

German authorities have already suggested that they nationalize medical supply chains from Asia for vital medical supplies, including presumably vaccines and other medications as well as medical equipment, like ventilators.

Clinical trials, fast-tracked vaccine production and new drug approvals are evidence of how quickly governments can work to produce new treatment options. Countries still hampered by the slow pace of cannabis reform should look at how a global health crisis has allowed governments to bypass certain areas of red tape, untethered by high prices in developing supply chains. While cannabis reform is indeed not the same as a global pandemic, it has the ability to save lives regardless. That ability should be enough impetus for quick reform, much like actions taken by governments so far during this crisis. Not to mention the fact that many cannabis patients are also the demographic of who is most vulnerable in this epidemic – the chronically ill and the elderly.

The International Cannabis Business Is Built on Global Supply Chains

In the U.S. right now, there is a significant concern about sourcing of the vaping industry (the vast majority come from Asia). In Europe this is of course far less of an issue. The only vapes of medical designation produced here are made by German Storz and Bickel.

However, there are other considerations. Right now, more cannabis is being imported than grown in Germany legally, Europe’s still largest medical market. And so far, most of the cannabis here is coming in from Canada, Holland or Portugal although domestic production has now been seeded from Greece and Malta to countries further east. There is only one entity (the former Wayland in partnership with the German Demecan) who is now even certified to produce in Germany.

Wash your hands, limit social interaction and cancel large events. Stock markets around the globe are in free fall as investors fear the crisis will plunge the global economy into a recession. This obviously affects publicly traded companies, as well as companies looking for capital. Expect the larger cannabis companies to continue taking bigger hits on their stock price.

But while borders are being closed all over Europe to people, emergency medical supplies and the like will increasingly be given priority.

How countries begin to view cannabis in this kind of epidemic is another question. It is certainly a drug of last resort right now, highly expensive and in many cases going to the elderly and those in palliative care. For this reason alone, cannabis companies need to step up to the plate. This industry is being built to serve the chronically ill. In other words, those people who are already most vulnerable to this virus.

But how to do that? Dronabinol (manufactured in Germany) is no longer the only option now available. It was patented as a direct response to the AIDS crisis in the early 1980s. But in a country with other options now, this is also on the plate.

So what can cannabis companies do during this time of crisis? For starters, read the guidelines on how companies can do their part to mitigate the spread of disease. Wash your hands, limit social interaction and cancel large events. Consider using in-store pickup or delivery options, where legal. And use telecommunications platforms like Skype or other remote cloud solutions to manage your workforce remotely.

Cannabis companies ought to have the wherewithal to do their part in mitigating the spread of COVID-19. As the global pandemic continues to spread outside of China (the only place where new infections are now levelling off), it’s increasingly important to monitor the situation and take extra precautions to mitigate the spread.

March 15, 2020

Coronavirus Guidelines for the Cannabis Industry

By Aaron Green

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The World Health Organization (WHO) recently recognized COVID-19, the disease caused by the coronavirus SARS-CoV-2, a pandemic. What can cannabis businesses do to help reduce transmission?

At the time of this writing, community transmission of COVID-19 has been observed in every continent except Antarctica. While China and South Korea are showing signs of containment, with negative disease growth rates, the rest of world is experiencing positive – and in some cases exponential – disease growth rates. Many companies in the cannabis industry are asking: what can we do to slow the spread of the virus and get ahead of the outbreak?

By adopting sensible policies, businesses play a key role in reducing disease transmission. On March 13, 2020, The International Chamber of Commerce (ICC), in collaboration with the WHO and New England Complex Systems Institute (NECSI), released Coronavirus Guidelines for Business, a summary of actions businesses can take to reduce immediate risks to employees and long-term risks to costs and profitability. The guidelines have since been delivered to more than 45 million businesses worldwide.

There are four sections to the guidelines:

General Recommendations
Meetings, Travel and Visitors
Workplaces
Retail and Hospitality

Specific recommendations relevant to the cannabis industry include working remotely where possible, avoiding unnecessary travel and keeping clear records of each day’s contacts. Where possible, a pick-up and drop-off service, home delivery or drive by services are recommended.

Businesses should be developing, readying and implementing business continuity plans based on the ICC guidelines. At this point, a conservative position would be to assume that if an outbreak has not been reported locally it is only a matter of time before local cases are reported. Specific actions businesses should take will depend on location, nature of the workplace and potential disruptiveness to operations.

The ICC and NECSI Coronavirus Guidelines for Business can be found here.

endCoronavirus.org is built and maintained by NECSI and its collaborators and specializes in networks, agent-based modeling, multi-scale analysis and complexity as it relates to COVID-19.

The International Chamber of Commerce (ICC) is the institutional representative of more than 45 million companies in over 100 countries. ICC’s core mission is to make business work for everyone, every day, everywhere. Through a unique mix of advocacy, solutions and standard setting, they promote international trade, responsible business conduct and a global outreach to regulation, in addition to providing market-leading dispute resolution services. Their members include many of the world’s leading companies, SMEs, business associations and local chambers of commerce.

The New England Complex Systems Institute (NECSI) is an independent academic research and educational institution with students, postdoctoral fellows and faculty. In addition to the in-house research team, NECSI has co-faculty, students and affiliates from MIT, Harvard, Brandeis and other universities nationally and internationally.

April 23, 2019

Eating Your Words: How to Avoid Legal Issues Marketing Cannabis Consumables

By Jennifer Whetzel

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Selling in a grey market isn’t for the faint of heart. You have to deal with the stigma surrounding your products and services, the potential for legal troubles, along with bureaucratic hurdles that all businesses face.

Acceptable marketing language surrounding consumable THC and CBD products encapsulates all of these issues, and it’s why everyone in the industry needs to pay close attention to what they’re saying. One innocent turn of phrase could have the Food & Drug Administration (FDA) shut down your business faster than you can say, “Oops.”

Avoiding this fate means making some adjustments to how you think about your marketing language, but this knowledge quickly becomes rote. Take a moment to learn how to protect yourself so that you can run your business rather than run afoul of the law.

Food, Drugs and Dietary Supplements

Scroll through Instagram for a few minutes and you’ll encounter a deluge of companies making claims about cannabis and CBD products. Many, if not most, are going about it incorrectly. Part of the confusion surrounds the fact that under the FDA’s rules, foods, drugs and dietary supplements are treated differently.

How does the FDA decide what’s what? Based on how you advertise the product. If labeling suggests the substance is “intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease, or is an “article” (other than food) intended to affect the structure or any function of the body of man or other animals,” the FDA will regulate it as a drug.

The language and regulations surrounding drugs are extremely strict. On December 20, 2018, the FDA put out a statement reiterating that these rules are in effect for cannabis products. In other words, you can only make a drug claim if you have received approval from the FDA on your New Drug Application (NDA). Since approval requires hundreds of millions of dollars worth of clinical trials, this option is out of reach for most companies.

The rule states that you may not say that your product diagnoses, cures, mitigates, treats or prevents any disease, or any recognizable symptom of a disease. Disease is defined as: damage to an organ, part, structure, or system of the body such that it does not function properly (e.g., cardiovascular disease), or a state of health leading to such dysfunction it (e.g. hypertension). Examples of diseases would include cancer, multiple sclerosis, epilepsy, autoimmune diseases, Lyme disease and more. In other words, you couldn’t say your product “prevents memory loss due to Alzheimer’s” or “treats symptoms of fibromyalgia.”

If you’re making any claims about curing anything in your cannabis business name, product name, packaging, web copy, advertising or marketing materials, you are at risk for breaking these rules and getting caught. The FDA’s regulations dovetail with the Federal Trade Commission’s truth-in-advertising laws, which state that your claims must be backed by legitimate research (such as peer-reviewed journal articles or double-blind studies) and must not mislead consumers. These rules are already being enforced within the cannabis industry, so pay close attention to what you’re putting out there.

An example of a warning letter the FDA sent to a CBD products company making health claims

However, you can’t avoid penalties by using this kind of language and claiming your product is a dietary supplement or food, either. According to the FDA, products that contain THC or CBD cannot be sold as dietary supplements. Their reasoning for this decision is that THC and CBD are active ingredients in FDA-approved drugs, such as Epidiolex and Dronabinol. Active ingredients in approved drugs may not be introduced into the food supply as dietary supplements or otherwise.

The language rules surrounding food can be equally complex. Foods approved by the FDA can make nutritional claims about how a nutrient impacts the structure/function of the body, such as “Calcium builds strong bones.” The problem for cannabis products is that these statements need to be authorized or qualified by the FDA and have significant scientific evidence and consensus. However, this consensus doesn’t exist for THC and CBD, meaning that you’re barred from making these kinds of claims.

Note that these rules don’t just apply to human supplements. They also apply to ones for pets. Many people don’t realize that a supplement for a pet is considered an “illegal drug of low regulatory concern.” But if you add in THC or CBD, a supplement becomes an illegal drug of—you guessed it—higher regulatory concern.

At a Loss for Words?

By now, you may be wondering what you can actually say to market your product; it may feel as though there are more restrictions than guidelines. Fortunately, the FDA hasn’t left us completely out at sea.

Just because we’re in a strange place under federal law operating our businesses every day doesn’t mean that we should disregard fundamental rules and regulations that all businesses must follow. The FDA published a final rule in the Federal Register in 2000 defining strict rules that govern the types of statements that may be used on a label without prior review of the agency. These are called structure/function claims. According to the FDA, “Structure/function claims may describe the role of a nutrient or dietary ingredient intended to affect the normal structure or function of the human body.” In contrast, statements that claim to diagnose, cure, mitigate, treat or prevent disease require prior approval by the FDA and are only for products that are approved drugs. Don’t use any of those words. Ever.

You can use the following words in your cannabis product names, advertising or marketing, as long as you’re not connecting them to a disease state: restore, support, maintain, raise, lower, promote, regulate, stimulate. You must specifically state that the claim relates to a non-disease condition; otherwise, you’ll be in trouble with the FDA. To go back to an earlier example, you cannot say that your product “prevents memory loss due to Alzheimer’s.” However, stating that your product “helps maintain a healthy brain” is fine.

Just because we’re in a strange place under federal law operating our businesses every day doesn’t mean that we should disregard fundamental rules and regulations that all businesses must follow. Following these rules does more than keep our enterprises out of trouble. It reinforces the idea that our industry is responsible, legitimate, and—perhaps most importantly—here to stay.

May 3, 2017

Applications for Tissue Culture in Cannabis Growing: Part 2

By Aaron G. Biros

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In the first part of this series, we introduced Dr. Hope Jones, who took her experience in tissue culture from NASA and brought it to the cannabis industry and C4 Laboratories. We discussed some of the essential concepts behind tissue culture and defined a few basic terms like micropropagation, totipotency, explants and cloning. Now let’s get into some of the issues with cloning from mother plants and the advantages that come with using tissue culture for propagating and cultivating cannabis.

Time & Resources

Dr. Hope Jones, chief scientific officer at C4 Labs

Taking cuttings from mother plants is arguably the most popular method of propagating cannabis plants. It is a process that requires significant real estate, resources and labor. “Moms can take up a great deal of space that is not contributing directly to production,” says Dr. Jones. “I know from experience that scaling up production and/or adding new strains to the production line requires significant time and resources to raise and maintain new healthy and productive mother plants.” Each mother plant produces a limited number of clones per harvest period and over the course of her life cycle.

By using tissue culture, a cultivator can generate an almost infinite number of clones from one plant cutting. With so many growers calculating their costs-per-square-foot, micropropagation is an effective tool to save space, labor and time, thus increasing profit margins. “Just to put it in perspective: Holly Scoggins’ book Plants From Test Tubes, cites a Day Lily cultivator who uses micropropagation to produce 1,000 plants in 30 square feet of shelf space each week,” says Dr. Jones. “Using conventional methods, one would need a half-acre to produce the same amount of plants.” Cultivators can produce a much greater number of plants-per-square-foot by using micropropagation effectively.

Damage from whiteflies, thrips and powdery mildew is all visible on this sick plant.

Early Health & Vigor

Most tissue culture methods use sterilized vessels that contain sugar-rich media to support growth of plantlets before they can photosynthesize on their own. “The media is prepped, poured into vessels, and placed in an autoclave (or pressure cooker) where it is subjected to high temps and pressure to achieve proper sterility.”

The sterile environment and rich growth media supplies plantlets with an abundance of everything they need. “When plantlets emerge from culture, they are pathogen-free, with a stockpile of food and nutrient reserves that support rapid growth and vigor, superior to conventional cuttings,” says Dr. Jones.

Stress & Disease

As any grower knows, mother plants can sometimes experience stress and disease. This might come in the form under or over-watering, heat stress, spider mites, whiteflies, mold and viruses. “Any stress or infection that a mother plant is subjected too can impact progeny health and productivity in a couple of ways,” says Dr. Jones.

Powdery mildew starts with white/grey spots seen on the upper leaves surface

For example, diseases like powdery mildew and tobacco mosaic virus are often systemic, meaning that pathogens have spread to almost every tissue in the plant. Once infected, it is impossible to completely eliminate pathogens from tissues. Therefore any cuttings made from a diseased mother plant, even if they look perfectly healthy, will also be infected and can eventually present disease symptoms like reduced productivity and/or plant death, according to Dr. Jones.

How does tissue culture get around this problem? Remember that explants (small tissue samples used as starting material) can be extracted from any part of the plant. Meristematic cells in shoot tips and leaves are the source of new plant growth. Dr. Jones explains that these cells, and the first set of primordial leaves are not connected directly to the vascular tissue, the plant’s transport system by which pathogens spread. Therefore, meristematic cells tend to be disease-free, whatever the condition of the mother. It takes a sharp blade, a dissecting microscope, and a lot of experience to learn, but as Dr. Jones explains, “harvesting explants from meristems is a routine micropropagation technique used by ‘Big Horticulture.’ One example is the strawberry. Viruses and pathogens are so prevalent that the strawberry industry must use meristematic culture to ensure pathogen free progeny.”

Epigenetics

Now let’s talk about epigenetics. We know that plants don’t have the option of physically moving away from stress or predation. Instead, they have evolved sophisticated ways of changing their own biology to adapt to and/or protect themselves. “Consider what happens to a mom exposed to a pathogen. The infected plant will start expressing (turning on) genes and making proteins that contribute to pathogen resistance,” says Dr. Jones. “These changes to gene expression are partly regulated by epigenetic modifications, chemical changes to DNA that increase or decrease the likelihood a cell will express a particular gene, but that do not actually modify the gene itself. Like annotations to a piece of music, epigenetic modifications don’t change the notes but rather how loud or soft, quickly or slowly the notes are played.”

There are more than 1,000 different viruses and mixed infections are very common

This is where it gets interesting. “Epigenetic modifications can be systemic and long lived. Plants infected by a pathogen or stressed by drought will present widespread epigenetic modifications to their DNA,” says Dr. Jones. “For an annual plant like cannabis, those modifications are relatively permanent. Thus a cutting from a mom having drought or pathogen adapted epigenetic programming will inherit that modified DNA and behave as if it were experiencing that stress, whether present or not.”

In the wild, this adaptability is critical for plant survival and reproduction, but to a grower, this is a less-than-ideal scenario. “The epigenetic modifications allowed the mother to tolerate the stress, which is great from the perspective of survival and fitness, but it comes at a cost. Some of the finite energy and resources that usually support plant growth and reproduction are instead channeled to stress response,” says Dr. Jones. This trade off results in reduction in overall plant yield and quality. “Those epigenetic changes result in a new phenotype for that mother,” says Dr. Jones. “All cuttings from her will reflect the new phenotype. This is one major mechanism underlying what many in the cannabis industry (incorrectly) call ‘genetic drift,’ or the loss of vigor over successive clonal generations.”

This is again where tissue culture can be such a game changer. The process of dedifferentiation, as explained in part 1 of this series, can rejuvenate a “tired” mother plant by inducing a kind of reboot– clearing accumulated epigenetic modifications that negatively impact progeny vigor and productivity. In the third part of this series, we will discuss the five stages of micropropagation, detailing the process of how you can grow plantlets in tissue culture. Stay tuned for more!