How to Get Rid of Spider Mites on Cannabis

If you’re a cannabis grower, then you know that spider mites can be a real pain. Here’s a guide on how to get rid of them for good.

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Spider mites are tiny pests that can wreak havoc on a cannabis plant. They are hard to see with the naked eye, but they can quickly ruin a crop if they are not controlled. These pests are known to cause leaves to turn yellow and drop off, and they can even kill a plant if they are not treated.

There are many ways to get rid of spider mites, but it is important to choose a method that will be effective without harming the plants. Some common methods include using predators, such as ladybugs or predatory mites, spraying the plants with water or an insecticide, or making a homemade solution of soap and water.

Whether you are growing cannabis for personal use or for commercial purposes, it is important to protect your investment from these destructive pests.

What are Spider Mites?

Spider mites are tiny sap-sucking pests that attack cannabis plants. They are less than 1/20th of an inch in size and can be difficult to see with the naked eye. These pests are serious agricultural pests that can destroy crops, so it’s important to learn how to get rid of spider mites on cannabis.

Spider mites are members of the arachnid family, which includes spiders, scorpions, and ticks. They have two body parts (a head and an abdomen), eight legs, and no wings. Their small size makes them difficult to control, as they can easily spread from plant to plant.

Spider mites are attracted to dry conditions and will often infest plants that are under stress. The presence of spider mites is often first noticed when tiny webbing appears on the plant leaves. The webbing is used by the mites to protect their eggs and ward off predators. As the infestation progresses, the leaves will become yellow or brown and may eventually die.

The Life Cycle of a Spider Mite

Spider mites are small arachnids that live and feed on the undersides of cannabis leaves. These pests are a serious problem for growers because they can quickly decimate a crop. A single mite can lay up to 20 eggs per day, and a female mite can live for up to two months. This means that a single mite can produce hundreds of offspring in her lifetime.

Spider mites go through four stages of life: egg, larva, nymph, and adult. The entire life cycle from egg to adult takes about two weeks under ideal conditions (warm temperature and high humidity).

Signs of Spider Mite Infestation

The most obvious sign of a spider mite infestation is the presence of webbing on the plant. The webbing is often most visible on the undersides of leaves, where the spider mites themselves are usually found. The webbing can also be seen on stems and flowers. Competition for food can cause leaves to curl up and turn yellow, eventually leading to necrosis (death) of the tissue. Heavily infested plants may have a overall “stunted” appearance.

Other signs of spider mite activity include:
-Yellow, red, or brown spots on leaves
-Leaf drop
-Silken webs between leaves and stems
-Speckling or stippling damage on leaves

Why Are Spider Mites Dangerous?

While most mites are harmless to humans, spider mites can be problematic because they feed on plants. They are especially dangerous to crops like cannabis because they can quickly reproduce and cause considerable damage in a short amount of time. A single female spider mite can lay up to 20 eggs per day, and a mature mite can live for up to two months. This means that a small infestation can quickly spirals out of control if left unchecked.

Spider mites are also difficult to control because they are so small – an adult mite is only about the size of a grain of salt. This makes them hard to spot with the naked eye, and they can easily go unnoticed until it’s too late. Plus, spider mites thrive in dry conditions, so they are often more prevalent during periods of drought or in areas with low humidity.

How to Get Rid of Spider Mites

Spider mites are one of the most common pests that attack cannabis plants. They are small, hard to see, and can do a lot of damage to your plants. If you think you have spider mites, it’s important to act quickly to get rid of them. In this article, we will show you how to get rid of spider mites on cannabis.


The best way to get rid of spider mites is to prevent them from getting on your plants in the first place. There are a few things you can do to make your grow room less inviting to these pests:

-Keep the grow room clean and free of debris. Spider mites like to hide in dirty places.
-Make sure all your plants are healthy. Spider mites are attracted to weak and stressed plants.
-Keep the humidity low. Spider mites don’t like it too moist.
-Use a fan to keep the air moving. This will make it harder for spider mites to stay on your plants.

If you already have spider mites, you’ll need to take action to get rid of them quickly before they do too much damage.

Physical Removal

One of the most common and effective ways to get rid of spider mites is through physical removal. This can be done with a number of different methods, including:

-Using a dish soap and water solution to spray down your plants and remove any visible spider mites.
-Using a hose or power washer to blast spider mites off of your plants.
-Picking spider mites off of your plants with a cotton swab or Q-tip.

These methods are typically most effective when combined with other methods, such asnatural predators or chemical controls.

Biological Control

Biological control of spider mites refers to the use of other organisms to keep spider mite populations in check. This can include releasing predators or parasites, or using fungal pathogens.

One of the most common and effective method of biological control is to release predatory mites. These tiny predators are natural enemies of spider mites, and can help to keep their populations in check. Some of the most commonly used predatory mites include Phytoseiulus persimilis, Metaseiulus occidentalis, and Neoseiulus californicus.

Another method of biological control is to use fungal pathogens. These are fungi that infect and kill spider mites, but are harmless to humans and other animals. One of the most commonly used fungal pathogens is Beauveria bassiana.

Biological control can be an effective way to get rid of spider mites, but it is important to note that it will not completely eliminate them. Spider mites are very small and mobile, which makes it difficult for predators or fungi to find and kill all of them. In addition, some spider mite populations have developed resistance to certain predators or fungi. For these reasons, it is often necessary to use a combination of methods to get rid of spider mites.

Chemical Control

The first step in chemical control is to identify the spider mites and assess the infestation. If caught early, spider mites can be controlled with a number of chemicals. Be sure to follow the label directions carefully.

A number of miticides (pesticides that kill spider mites) are available for use on cannabis. The most effective products contain abamectin, bifenazate, fenbutatin oxide, hexythiazox, or pyrethrins.

To prevent resistance, rotate between products with different modes of action. For example, if you start with a product that contains abamectin, rotate to a product with a different active ingredient next time you treat for spider mites. You can find this information on the product label.

There are also a number of organic options available, although they may be less effective than chemical products. Insecticidal soaps and horticultural oils can kill spider mites on contact, but they must come into direct contact with the mites to be effective. These products can also kill beneficial insects, so be sure to use them only as a last resort.


To get rid of spider mites on cannabis, start by controlling the environment and pests around your grow space. Inspect your plants regularly for signs of infestation, and quarantine any plant that shows evidence of spider mites. To kill spider mites on plants, try using a mixture of water and alcohol or soapy water. You can also use neem oil or introduce predatory insects, like ladybugs, into your grow space.

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