Pests in marijuana: a complete guide

Pests in marijuana: a complete guide

Pests in marijuana: a complete guide

Like all animals and their sister plants, marijuana is susceptible to disease. Among the pests in grass are insects, fungi and lastly viruses.

As growers, we must be able to identify what is the problem that afflicts our little ones, and then find the right treatment.

Attacking the various pests in marijuana can be a very complicated task, requiring careful and careful observation.

In this post, we will give you the primary considerations that you must take into account, and we review the most common pests on our side of the world.

What to do first before possible pests in marijuana?

Every grower, with little experience, has come to check their plants and has found that something is wrong. 

There are many signs of trouble. The challenge is to know what exactly is the cause and then face it.

That is why we will start talking about the most common mistake, which is to confuse the lack of nutrients with a plague.

Many times stains, dryness or discolouration appear on the leaves, which makes us think that our plants are under attack. That is why if we have symptoms such as lack of green, spots that are repeated only on the leaves below, or only on the leaves above, or that are seen simultaneously on all the leaves, it is likely that we are facing a lack of nutrients (lack of fertilizer).

Because of this, to deal with pests in cannabis, you must first rule out the problem of fertilization, and then investigate if you are facing a pest.

Remember that if you have questions, you can send photos to our Notorious experts who can guide you through the process.

Note: When taking photos of pests in marijuana, try to do it in standard and daylight, and not in grow lights (like HPS or LED ) as it interferes with colours.

Try to take photos of both the entire plant and in detail of the affected leaves. Do not share those photos in any untrusted medium. In Notorious, your photos are anonymous.

Next, we detail the different types of pests:

Insects and Mites

They are the most natural pests to discover and identify since their signs are more evident. Often insects are seen with the naked eye.

Insects and Mites

There are hundreds of varieties of insects and mites, and here we review the most common.


They are the larvae of butterflies.

They attack our marijuana plants by biting their leaves, starting at the bottom and the edge of the sheet usually.


They feed at night, so if you see signs that the leaves have been bitten.

Check your plants in the night cycle. There you can find the caterpillars touring your plant. In the daytime, they usually hide in the ground.

These insects are much more frequent in outdoor crops than indoors.

The eggs are often hidden in the earth so that a substrate acquired grow shop established ensures you probably will not have this problem.

If they are not controlled in time, the Caterpillars also promote the appearance of moulds, especially botrytis.



Although they appear more frequently outdoors, they are one of the most frequent pests in indoor and greenhouse crops.

Like caterpillars, they hide in pots, so eradicating them involves treating both the leaves and the pot and the pot dish.

They measure between 0.5 and 1.2 mm. Trips have white eggs that deposit inside the leaves.

This is achieved by eating the inside of the leaf, generating small channels inside.

The channels have a white colour at first, but in an advanced state, the leaves turn silver in the affected parts and tend to dry brown.

They are not usually lethal in plants, but eradicating thrips is quite tricky, so using preventive products is the best option.

They can also actively reduce the production of our plant if they are not managed.


It is a natural pest to recognize, as it is indeed a small white or slightly yellowish fly, about 2mm, that lives in the lower part of the leaves (that is, the back of the blade).


They can lay up to 200 eggs in the same breeding cycle, which are white and adhere firmly to the leaf.

They produce visible dryness, mainly at the edges of the leaves, since they suck the pulpy interior of the leaves, generating chlorosis and necrosis.

If you find a few whiteflies, you can use products with Neem Oil and Potassium Soap to repel. Basil is also a natural whiteflies repellent.

If there are already eggs, and you see that the plague on your marijuana plant is advanced, you will have to remove the most affected leaves, in addition to applying plant protection products. 

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