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The Beginner’s Guide to Integrated Pest Management

By David Perkins
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Formulating a Plan

In this article you will learn how to control pests and improve the health of your cannabis plants using integrated pest management, commonly referred to as IPM. This involves a multi-point strategy – there is no quick fix, nor is there one solution that will wipe out all your pest problems. Proper pest management requires patience, consistency and determination.

It is important to understand that not all pesticides are bad. While many are incredibly harmful not only to pests, but also humans, in this article I will educate you about some of the safer alternatives to traditional pesticides. It is possible to safely control unwanted pests in your cannabis garden without harming yourself, your employees or the natural habitat around you.

Every cultivation facility should have a well-thought-out plan for their pest management program. This program should account for the prevention, and if necessary, eradication of: spider mites, russet mites, fungus gnats, root aphids, thrips and caterpillars. These are just a few of the more common pests you’ll find in a cannabis garden. There could also be many other less commonly known bugs, so you have to be vigilant in looking closely at your plants, and the soil, at all times. Complete eradication of a targeted pest can be difficult. Once a pest has established itself, decimating or decreasing the population will require an aggressive regimen that includes spraying daily to control populations and prevent other pests from getting established.

Spraying or applying pesticides to the foliage of plants isn’t the only way to control or eradicate pest populations. There are many other ways that you can minimize the spread of pests without the use of pesticides. In greenhouse and outdoor grows, growing specific types of plants around the cultivation area will attract both beneficial and predator bugs that will naturally control pest populations. Some plants that attract these bugs are: mint, peppers, and marigold. Beneficial and predator bugs, such as ladybugs, predator wasps and predator mites, can control unwanted pest populations in the area before they even have a chance to become a problem in your garden. Plants and flowers that attract bees, birds and insects will also create helpful bio- diversity, making it more difficult for the unwanted pests to thrive.

For indoor cultivation, it is imperative that you have your cultivation facility set up for a proper workflow. If you already have pests, you need to make sure you are not contaminating the rest of your facility when going from one area to the next. Make sure that you only go to contaminated areas at the very end of your day, and when you’re done working in that area, you must immediately exit the building. Do not ever walk back through the uncontaminated parts of your facility or the pests will spread quickly.

An aphid on a plant in a greenhouse

When most people think of pests in their cannabis garden they think of the more common varieties: spider mites, russet mites, aphids and thrips. However, there are also soil-dwelling pests that can exist, without your knowledge. These will decrease the health and vigor of your plants, without you even knowing they’re there, if you’re not careful to check for them. Some of the soil dwelling pests that plague cannabis plants are: root aphids, fungus gnat larvae and grubs. It is just as important to control the pests below the soil, feeding on your roots, as it is to control the pests that feed above soil on your plants.

Maintaining healthy plants is essential to controlling pest populations, both on the foliage and below the soil. Healthy plants will have an easier time fighting off pests than unhealthy plants. Plants have immune systems just like humans, and the stronger the plant’s immune system, the more likely it will be able to ward off pests and diseases. Allowing a plant to reach its full potential, by minimizing pests, means your plants will also have a better quality, smell and flavor, not to mention a bigger yield.

Worker Safety, Regulation and REI times

The application of pesticides requires certification from the state agricultural department. In certain situations, depending on the type of pesticide and method of application, a license may even be required. The application of pesticides without proper certification is against the law. Applying pesticides in a manner that is not in accordance with the label and instructions is also a violation of law.

The proper personal protective equipment (PPE) is required for anybody handling, mixing or applying pesticides. Employees can be a liability to your company if they are applying pesticides improperly. Make sure you and your entire staff are well educated about pesticide use requirements and limitations, prior to usage, and that only a properly certified person is handling the mixing and application at your facility.

The author, David Perkins, In his greenhouse after using insect killing soap.

After a pesticide is applied, you must abide by the re-entry interval (REI). This is the required time period limiting all workers from re-entry into areas where pesticides have been applied. This time period will vary depending on the type of pesticide used and the method of application. In some instances, pesticides applied in the last 30 days may require employee training before work can be done in those areas.

The misuse of or improper handling of pesticides is not only unlawful and dangerous to human health, but can also cause environmental damage to waterways and wildlife. The direct effects of pesticides on wildlife include acute poisoning, immunotoxicity, endocrine disruption, reproductive failure, altered morphology and growth rates and changes in behavior. Pesticides can indirectly impact wildlife through reduction of food resources and refuses, starvation due to decreased prey availability, hypothermia and secondary poisoning. Section 1602 of the California Fish and Game Code governs requirements for permitting of any project where pesticides will be used, and strictly regulates the disposal of all waste and run-off. It is imperative to know the regulations and to abide by them, or heavy fines will ensue!

Using Pesticides in a Regulated Market

Knowing which pesticides you can’t use, to avoid failing mandatory state testing, is just as important as knowing which ones you can use safely to pass required testing. Most states with regulated markets have strict limitations on the pesticides that can be used in cannabis cultivation. Pesticide use in the cultivation of cannabis is the most strictly regulated in the agriculture industry; the pesticides allowed for use in cannabis cultivation are far more limited than any other crop.

Photo: Michelle Tribe, Flickr

Just because a product is certified organic does not mean that it can be used, or that it is safe to be consumed or ingested. Oftentimes when cannabis flower alone is tested it will not fail or show a detectable amount of pesticides or heavy metals. However, when that flower is turned into concentrates, banned substances are then detected in testing, leading to test failures.

Cannabis cultivation facilities that are located on land that was previously used for conventional agriculture, or located near vineyards or other agricultural crops that are heavily sprayed with harmful pesticides, run a very high-risk failing testing. This is because of either spray drift from nearby agriculture, or residual pesticides and heavy metals left in the soil from previous crops that were using pesticides banned for cannabis cultivation. Accordingly, if you’re going to be growing outdoors or in a greenhouse, it is imperative that you get a soil and water test prior to cultivation, so you can determine if there is any potential for test failures due to pesticides or heavy metals in the soil or water in that area. 

Proper Application – Using the Right Tools in the Right Way at the Right Time

One of the most important factors in pest management is proper identification of pests and proper application and coverage of pesticides. It does not require an entomology degree to identify insects, these days there is a lot of information online that can help you identify cannabis pests. Proper identification of insects can make the difference between success and failure. With a good eye and a microscope, if you do your research, you can control most insects in your garden.

In order to control pests in your garden you must get proper coverage of the foliage of the plant when you are applying pesticides. There are different types of equipment that are commonly used to apply pesticides in cannabis cultivation: backpack sprayers, foggers, and airless paint sprayers are the most common. An alternative method involves using an automated dosing system such as a dosatron, which injects fertilizer or pesticides at a specific ratio into your water lines, allowing you to use only the exact amount of pesticide you need. That way you avoid wasting money on unused pesticides. It is also safer for employees because it minimizes employee exposure, since there is no mixing required, and it allows for a large volume to be sprayed, without refilling a tank or a backpack sprayer.

No matter what you are using you must ensure you get the proper coverage on your plants in order to control pests. The temperature and humidity of your cultivation area, as well as the PH and temperature of the pesticide solution, all factor into the success of your IPM. For example, PFR 97 needs to be applied at a higher humidity range, around 70% to be most effective. In some areas this is not possible so repeated applications may be required to ensure the application is effective. A high PH or alkaline PH can cause alkaline hydrolysis which will make your pesticide solution less effective and will dictate how long your pesticides remain effective after they are mixed. It is therefore important to use your pesticide solution as soon as you make it; don’t let it sit around for long periods of time before use or it will be less effective.

In cannabis cultivation there are two different primary growth cycles: vegetative and flower. These cycles require different IPM strategies. In general, during the flowering cycle, pesticides should not be applied after the second week, with some limited exceptions i.e. for outdoor cultivation there is a longer window to spray since the flower set takes longer than a plant being grown inside, or in a light deprivation greenhouse, where there is a 12/12 flowering cycle.

Starting with an immaculate vegetation room is crucial to maintaining pest and mold free plants in the flowering cycle.

For the vegetative (non-flowering) cycle, a strict rotation of foliage spray applications targeting not only pests, but also molds and pathogens, will be necessary to avoid a quick onset of infestation. Starting with an immaculate vegetation room is crucial to maintaining pest and mold free plants in the flowering cycle. Preventative sprays that are safe for use include: safer soap (contact kill) for soft bodied chewing insects; Regalia (biological control) for powdery mildew; and PFR 97 (biological control) for soft bodied chewing insects. It is also helpful to spray kelp, which strengthens the cell walls of plants, making the plant healthier, and thus enabling the plant to better defend itself from pests and diseases. Also, Bacillus thuringiensis (Bt) is useful to prevent or kill caterpillars.

The best way to control a pest infestation in the flowering cycle is at the very beginning on day one. You must start aggressively, with a three-way control consisting of a contact kill and preventative during days 1-14; preventative and biological control during days 10-18; and then release predator bugs on day 25, for optimal results. Knocking back the population with an effective contact kill pesticide early on is essential to ultimately lowering populations throughout the grow cycle, so that you can spray a biological control to preclude them from returning, before you release the predatory bugs at the end of the cycle.

Biological controls can take anywhere from 3 to 10 days before they are effective. Biological pesticides are selected strains of bacteria or fungus. When the plant tissue is eaten by a targeted pest, the bacteria kills the pest from the inside providing control without having to spray pesticides repeatedly. Predator bugs are the last line of defense, used in late flowering. They can be used indoors, outdoors and in greenhouses. An example of a common predator bug is Amblyseius californicus used to control low populations of spider mites, but there are many different varieties and they are specific depending on the type of pest population you seek to control.

A common concern with the use of predatory bugs, is whether they will be present when the flowers are harvested. However, if there is no food for the bugs (i.e. pests) the predator bugs will leave in search of food elsewhere. Further, indoor predator bugs are usually very small in size and difficult to see to an untrained eye. It is very unlikely to see any signs of predator bugs near the end of the flowering cycle, or in the finished flower product. Even when using bigger predator bugs, the bugs will leave the plants when harvested and dried.

Having pests can be very stressful. It is not uncommon to have bugs, pests, rodents, animals and birds cause damage in cannabis gardens. Making an informed decision based on science and not on unproven assumptions can determine how successful you are at pest management. There are many factors that go into pest management and no one situation is the same. You must be dedicated and consistent; pest management never stops. You will always have something ready to invade your garden. Prepare, plan, prevent and repeat!

Epidiolex-GW

GW Pharma’s Enormous Price for Epidiolex

By Marguerite Arnold
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Epidiolex-GW

In a fascinating early August conference call with Seeking Alpha, British-based GW Pharmaceuticals finally revealed their retail price point for CBD-based drug, Epidiolex, as it goes into distribution in the U.S.

The drug is designed for the treatment of certain kinds of childhood epilepsy – although not all kinds. Also notable of course, is that GW Pharma’s “other” drug for treatment of resistant epilepsy failed in late stage trials in Eastern Europe earlier this year. It also knocked off 5% of the price of the company’s stock.The company is estimating it has a potential patient pool of between 25,000- 30,000 patients in the U.S.

British Advocacy Over Access And Pricing

The ineffectiveness of GW Pharma’s drugs for many patients (along with the cost charged for them) was responsible for pre-empting the entire access discussion in the UK this year. The mother of an epileptic British child tried to import a personal store of cannabis oil (produced by Canadian LP Tilray) only to have it confiscated at the airport this summer. Her son ended up in the hospital shortly thereafter.

The national uproar this caused pushed forward the country’s new medical cannabis policy– indeed drug rescheduling is due to go into effect in October. Conveniently, right as Epidiolex goes on sale in the U.S. (where cannabis remains a Schedule I drug).

The company is estimating it has a potential patient pool of between 25,000- 30,000 patients in the U.S.

Price Tags and Politics

What is the price of Epidiolex? $32,500 per patient, per year. If that sounds high, the company insists it is pricing the drug to be “in line” with other drugs for this segment of the market.

The majority of this cost will not be picked up by private health insurers but rather the federal governmentActually, according to industry analysis, this is about 70% more than the price of one comparable drug (Onfi), and slightly more expensive than Banzel, the two competing (non-cannabinoid based) medications now available in the U.S. for this market.

Here is the other (widely unreported) kicker. The majority of this cost will not be picked up by private health insurers but rather the federal government, which is also not negotiating with GW Pharma about that high price  (unlike for example what is going on in Europe and the German bid).

Why the difference?

Two reasons. The first is that Epidiolex has obtained “orphan drug” status (a medication for a disease that affects fewer than 200,000 patients in the U.S.) The second is that the majority of the insurance that will be picking up this tab is Medicaid. The patient pool will be unable to afford this. As a result, the bulk of the money will remit not from private insurance companies but rather federal taxpayers. And, unlike in say, Germany, none of this is pre-negotiated in bulk.

Epidiolex-GW
What is the price of Epidiolex? $32,500 per patient, per year.

Co-payments are expected to range from $5 to $200 per month per patient after insurance (read: the government) picks up the tab. This essentially means that the company plans to base participation at first at least on a sliding scale, highly subsidized by a government that has yet to reschedule cannabis from a Schedule I in the U.S.

Creating, in other words, a new monopoly position for GW Pharmaceuticals in North America.

A Hypocrisy Both Patients And The Industry Should Fight

The sordid, underhanded politicking that has created this canna monster is hardly surprising given the current political environment in both the U.S. and the U.K. right now. The people who benefit the most from this development are not patients, or even everyday shareholders, not to mention the burgeoning legitimate North American cannabis industry, but in fact highly placed politicians (like British Prime Minister Theresa May). Philip May, the PM’s husband’s firm is the majority shareholder in GW Pharma. Her former drugs minister (with a strong stand against medical cannabis) is married to the managing director of British Sugar, the company that grows GW Pharma’s cannabis stock domestically.

So far, despite a domestic outcry over this in the UK (including rescheduling), there has been no political backlash in the United States over this announcement. Why not?

Look To Europe For A More Competitive Medical Market

This kind of pricing strategy is also a complete no go in just about every other market – including medical-only markets where GW Pharma already has a footprint.

For example, German health insurers are already complaining about this kind of pricing strategy for cannabis (see the Cannabis Report from one of the country’s largest insurers TK – out earlier this year). And this in an environment where the government, in fact, does negotiate a bulk rate for most of the drugs in the market. Currently most German cannabis patients are being given dronabinol, a synthetic form of THC which costs far less.

GW logo-2On top of this, there are also moves afoot by the German government to begin to bring the costs of medical cannabis and medicines down, dramatically. And this too will impact the market – not only in Europe, but hopefully spark a debate in every country where prices are also too high.

The currently pending German cultivation bid for medical cannabis has already set an informal “reference” price of at most 7 euros a gram (and probably will see bid competitors come in at under half that). In other words, the government wholesale price of raw, unprocessed cannabis flower if not lightly processed cannabis oil is expected to be somewhere in the neighbourhood of 3-4 euros per gram come early next year. If not, as some expect, potentially even lower than that.

Processed Cannabis Medicine vs. Whole Plant Treatment

The debate that is really raging, beyond pricing, is whether unprocessed cannabis and cannabis oil is actually “medicine.” At the moment, the status quo in the U.S. is that it is not.

GW Pharmaceuticals, in other words, a British company importing a CBD-based derivative, is the only real “medical cannabis” company in the country, per the FDA. Everyone else, at least according to this logic, is placed in the “recreational camp.” And further, hampered still, with a lack of rescheduling, that affects everyone.

If that is not an organizing issue for the American cannabis industry, still struggling with the many issues inherent in the status quo (from insurance coverage and banking to national distribution across state lines) leading up to the midterms, nothing will be.