How To Deal With Broad Mites On Cannabis Plants

How To Deal With Broad Mites On Cannabis Plants


Broad mites are tiny, yet destructive pests that can wreak havoc on cannabis plants, leading to stunted growth, yellowing leaves, and diminished yields. In this comprehensive guide, we'll explore the identification, prevention, and treatment of broad mites on cannabis plants, ensuring that you're well-equipped to protect your precious crops.

What Are Broad Mites?​

Broad mites, scientifically known as Polyphagotarsonemus latus, are minuscule garden pests that can infest a wide variety of plants, including cannabis. These microscopic parasites belong to the Tarsonemidae family and are not classified as insects. They are prevalent in tropical and temperate climates and thrive in greenhouse environments.

Despite their minute size, broad mites can cause significant damage to cannabis plants by feeding on plant sap and injecting toxic substances that disrupt growth and cause nutrient deficiencies. Identifying and dealing with broad mite infestations is essential for maintaining the health and productivity of your cannabis plants.

Identifying Broad Mites​

Adult broad mites are roughly 0.25 mm in length, with a dark green to amber coloration, a shiny appearance, and an oval shape. Their tiny size makes them difficult to detect with the naked eye, and a minimum of a 60x magnifying glass is required for correct identification.

Broad mites lay oval-shaped, translucent eggs on the undersides of leaves and on flower surfaces. These eggs, which measure approximately 0.08 mm in diameter, have tiny white spots or tufts of hair on their surfaces.

The damage caused by broad mites is often hard to diagnose, as they primarily feed on newly developing and young leaf tissue. Symptoms of broad mite infestation include yellowing foliage, curling or drooping leaves, glossy or wet-looking leaves, and stunted growth.

Broad Mites Life Cycle​

The life cycle of broad mites is rapid and short-lived, taking place in four stages: eggs, larvae, nymphs, and adults. Female broad mites can lay 30-76 eggs over 8-13 days, with a gender ratio of four females to one male. These eggs hatch within 2-3 days, and the larvae that emerge begin feeding on plant material immediately. After 2-3 days, the larvae morph into quiescent nymphs before developing into adults.

Understanding the life cycle of broad mites is crucial for implementing effective treatment and prevention strategies. Their fast reproduction rate and short time from egg to sexual maturity mean that broad mite populations can explode rapidly, making early detection and intervention essential.

Symptoms of Broad Mite Infestation​

The symptoms of a broad mite infestation can be easily mistaken for nutrient deficiencies or other crop viruses, making accurate identification challenging. Common symptoms of broad mite damage include:

  • New growth appearing drooping, twisted, or blistered with a wet appearance
  • Leaves curling up around the edges
  • Distorted and malformed growth
  • Inconsistent damage, with the worst areas located where the infestation is concentrated
  • Brown or curling leaves
  • Sickly-looking buds that eventually die during the flowering stage
If you notice any of these symptoms in your cannabis plants, it's crucial to act quickly and accurately identify the cause of the issue.

How to Treat Broad Mites on Cannabis Plants​

Once you've confirmed that broad mites are the cause of your cannabis plant's issues, it's time to implement a treatment plan. Here are several methods for dealing with broad mite infestations on cannabis plants:

Neem Oil​

Neem oil is a popular all-natural solution for a wide variety of pests, including broad and russet mites. To use neem oil, mix it in a mister according to the packet instructions and apply it to the affected areas of your plant. Be cautious not to spray neem oil on your buds, as it can leave an unpleasant taste. Apply neem oil once, then monitor your plants' progress over the next 1-2 days before applying a second time. Repeat this process as necessary until the mites are gone.

Insecticidal Soaps​

Insecticidal plant soaps are effective for spot-treating parts of your plants affected by broad mite infestations. These soaps are ideal for use on smaller infestations and flowering plants. Apply them multiple times for the best results, but avoid getting the soap on your buds.

Other Oils​

Essential plant oils and horticultural oils are increasingly popular alternatives to harsh chemical insecticides. Some common natural oils used to control garden pests include eucalyptus, rosemary, lemon, and cinnamon. Mix these oils with water and apply them liberally to your plants' foliage using a mister. Be aware that these oils possess strong aromatic qualities that can affect the flavor and aroma of your plants, so avoid getting them on buds.

Chemical Insecticides​

In some cases, broad mite infestations may be so severe that chemical insecticides are necessary. While these products contain harsh chemicals that can stress your plants and produce potentially toxic runoff, they are highly effective at dealing with a wide variety of garden pests. Apply chemical insecticides according to the manufacturer's instructions and be prepared to flush your soil thoroughly after treatment. Then, resume your regular nutrient routine.

Preventing Broad Mite Infestations in the Future​

Prevention is always better than treatment when it comes to dealing with garden pests. To minimize the risk of future broad mite infestations, take the following steps:

  • Maintain a healthy growing environment with proper ventilation, circulation, temperature, and humidity levels
  • Regularly inspect your plants and act quickly at the first sign of stress
  • Quarantine new plants or clones before introducing them to your main growing area
  • Implement an integrated pest management (IPM) program, including regular applications of neem oil or other natural insecticides
By being proactive and vigilant in your cannabis plant care, you can prevent broad mite infestations and ensure the health and productivity of your crops.

Broad Mite Management in Greenhouses Using Biocontrol​

Neoseiulus californicus is a predatory mite that is effective as a biocontrol option for managing broad mite infestations in greenhouses with humidity levels below 60%. Introduce these predators as a preventative measure or to help eliminate hot spots in your greenhouse. Monitor predator activity weekly by looking for shriveled pest mites and larval development within the colonies. Concentrate predator release in hot spots and store them at a minimum temperature of 55 degrees Fahrenheit for no more than five days.

How to Get Rid of and Eradicate Broad Mites Naturally​

The best way to get rid of broad mites naturally is to:

  • Apply Trifecta Crop Control diligently
  • Remove infected areas immediately
  • Introduce predatory mites, such as Neosiulus species
Essential oils are often highly effective against broad mites, making products like Trifecta Crop Control an excellent choice for repelling and combating broad mite infestations. For severe infestations, you may need to remove and discard infected plant tissue before treating the remaining plants with natural miticides or biocontrol agents.

How to Naturally Prevent Broad Mites​

Broad mite prevention involves several strategies, including:

  • Implementing an integrated pest management (IPM) program with regular applications of natural insecticides like Trifecta Crop Control
  • Quarantining new plants or growing from seed indoors to minimize the risk of introducing mites
  • Providing a suitable environment for plant growth, including proper circulation, ventilation, humidity, and temperature control
  • Regularly inspecting plants for signs of infestation and taking prompt action if mites are detected
  • Installing air intake filters to prevent pests from entering your growing area
By following these preventative measures, you can protect your cannabis plants from broad mite infestations and ensure a healthy, productive harvest.

In conclusion, dealing with broad mites on cannabis plants requires diligence, early detection, and effective treatment strategies. By understanding the life cycle, symptoms, and management options for these pests, you can safeguard your cannabis plants and enjoy a bountiful harvest.
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