Cannabis Root Aphids: What Is It & How To Protect Your Plant

Cannabis plants are commonly grown for medicinal and recreational use, and growers need to understand the potential problems that can arise during cultivation. One such problem is infestation by root aphids, and people all over the world experience this problem at least once in their life while growing cannabis plants.

In this article, you can get to know what root aphids are, how they affect cannabis plants, and what can be done to prevent and treat infestations. If you are growing cannabis plants, then you must pay attention to the changes as they might be a symptom of some problem. Read this post till the end, and you will be able to understand the causes and prevention of root aphids to protect your plants.

What are Cannabis Root Aphids?

Cannabis root aphids are tiny, sap-sucking insects that feed on the roots of cannabis plants. They are part of the family Aphididae and are commonly found in soil and hydroponic systems. Root aphids are small, measuring only 1-2 millimetres in length, and are typically yellow, green, or black in colour. They are often difficult to see without close inspection and can reproduce quickly, leading to infestations that can cause significant damage to cannabis plants.

How Do Root Aphids Affect Cannabis Plants?

Root aphids feed on the sap from the roots of cannabis plants, causing the plants to become stunted and unhealthy. The sap-sucking behaviour of root aphids can also interfere with the plant’s ability to absorb water and nutrients, leading to further stress and damage. In severe infestations, root aphids can cause the roots of cannabis plants to rot, leading to the death of the plant.

In addition to feeding on the roots of cannabis plants, root aphids can also spread plant viruses, including mosaic virus and cucumber mosaic virus. These viruses can lead to further stunting and death of the plants and can also be spread to other plants in the same growing area. Here are some of the ways you can identify if your plant is infected with root aphid, as these are the general symptoms that generally occur:

  • The growth of the plant has stopped.
  • Leaves have started turning yellow in colour.
  • The plant has lost its ability to absorb water.
  • No new buds or leaves are forming.
  • Insects start gathering near the plant.
  • Cast skin building up on the leaves.

Preventing and Treating Root Aphid Infestations

The best way to prevent root aphid infestations is to take proactive steps to maintain a clean and healthy growing environment. This includes regularly checking the roots of cannabis plants for signs of infestation and removing any infected plants promptly. It is also important to avoid over-watering and to avoid allowing standing water to accumulate in the growing area, as this can create a moist environment that is conducive to the growth of root aphids.

If an infestation is detected, it is important to take steps to control the spread of the pests and to treat the affected plants. This may include the use of insecticidal soap, neem oil, or other organic treatments, as well as the use of beneficial insects such as ladybugs or lacewings. In some cases, chemical treatments may be necessary, but it is important to follow the manufacturer’s instructions carefully and to avoid using more products than necessary.

In addition to these preventative and treatment measures, it is also important to monitor the growing environment for any changes that could indicate an infestation. This may include changes in the appearance of the plants, unusual growth patterns, or signs of root damage. By being vigilant and taking steps to prevent and treat root aphid infestations, growers can help to ensure the health and productivity of their cannabis crops.

FAQS Related To Cannabis Root Aphids

What Kills Root Aphids Fast?

There are several methods to eliminate root aphids on cannabis plants, and the best approach may vary depending on the specific growing conditions and severity of the infestation. Chemical insecticides, such as neonicotinoids, pyrethroids and organophosphates, can effectively kill root aphids.

Neem oil, derived from the neem tree, disrupts the pest’s life cycle. Essential oils, such as peppermint, lavender and rosemary, can repel root aphids. Proper cultural practices, such as soil moisture management and plant health, can reduce the risk of infestations.

How Do I Know If I Have Root Aphids?

We have already told you the symptoms and signs of root aphids and how you can easily identify if your plant is infected with them. Remember that the symptoms completely depend on the age of the plant, temperature, strain you are growing, and many other things.

Some of the most common signs are slow growth of the plant, visible pests around the soil or veins, the plant stopped consuming water, yellowing of the leaves, and leaves curling downwards. We will recommend you to check the pH level of the soil and sometimes flush your planter and soil with balanced pH water to ensure everything is in stable condition.

What Temperature Kills Root Aphids?

Temperature can be a factor in killing root aphids, but it depends on the species and conditions. Most root aphids can’t handle high heat, typically above 80°F. However, root aphids have a broad temperature tolerance, and some species can endure cooler temperatures. Hot water dips or steam flushing can be an effective way of killing root aphids, but the specific temperature and time will depend on the species and type of cannabis plant.

Heat treatment should be used with other pest control methods as it may not be enough to fully control the infestation. Excessive heat or prolonged exposure can harm the plants, so care must be taken.

How Do You Use Hydrogen Peroxide To Get Rid of Root Aphids?

Hydrogen Peroxide is definitely a great solution to this problem but only when used appropriately. If you don’t know how to use it to get rid of root aphids, then we will recommend you consult a professional grower. All you have to do is to add some Hydrogen Peroxide to the soil, and it will bring up the level of oxygen in the soil, killing the root aphids as well as their eggs too.

  • You need to mix about 3% of Hydrogen Peroxide with water in a 1:1 ratio.
  • Now, pour the solution near the affected root, making sure the solution is all over the roots.
  • You might have to repeat the same thing for several weeks before killing the entire root aphid population.

Are Root Aphids Visible?

Root aphids are pests that live and eat the roots of plants. They are not easily seen because they are underground. However, if you notice yellow leaves, slow growth, or problems with the roots, you may have root aphids.

To check, you can take the plant out of the soil and look at the roots for small white bugs or sticky stuff. If you think you have root aphids, it’s important to do something about it soon, so the plants don’t get more damage.


Root aphids can be a significant problem for cannabis growers, causing stunted growth, reduced yields, and even the death of plants. To prevent and treat root aphid infestations, it is important to maintain a clean and healthy growing environment, take proactive steps to monitor for infestations, and to use appropriate treatments as needed.

By taking these steps, growers can help to ensure the health and productivity of their cannabis crops and avoid the economic losses that can result from root aphid infestations. If you know something about cannabis root aphids that we have not mentioned here, or you want assistance in getting rid of this problem, then do connect with us via the comments below.

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