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15 Natural Ways to Get Rid of Root Knot Nematodes

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15 Natural Ways to Get Rid of Root Knot Nematodes

Have you noticed small, knotted bumps on the roots of your plants? If so, then you are likely dealing with root knot nematodes.

So what are they? These pests are worm-like organisms that live in the soil.

They feed on a variety of plant roots and can cause serious damage to crops. They cause plants to become stressed and find it difficult to take up water or nutrients [1].

In this article, I’ll share some tips that I’ve picked up on how to control these nematodes organically.

Crops Susceptible to Root-Knot Nematodes

Several types of crops are particularly susceptible to these pests, including:

  • Tomatoes
  • Lettuce
  • Peppers
  • Squash
  • Carrots
  • Okra
  • Irish potato
  • Eggplant

These soil-borne pests can cause stunted or abnormal root growth, wilting, and even death in severe cases. You may also notice that plants take longer to mature and yield smaller fruits and vegetables.

How to Get Rid of Root-Knot Nematodes Naturally

Below are some effective home remedies and natural methods for controlling root knot nematodes.

1. Crop Rotation

Rotate your crops. This can be a great way to prevent the buildup of pests and diseases in the soil.

When rotating your crops, make sure they don’t belong to the same family. It’s best to alternate between different families of plants.

2. Natural Predators

Introduce beneficial organisms to your garden soil. This may help control plant-parasitic nematodes.

For example, predacious nematodes are organisms that eat other types of harmful nematodes in the garden. Other natural predators include flatworms and mites [2].

3. Soil Solarization

This technique uses the sun’s heat to control soilborne pests like root knot nematodes. It’s basically a form of solar-powered pest control.

It uses something like a tarp to trap solar heat in the soil. This causes the nematodes and insects in the soil to die, due to the extreme temperatures.

4. Nematode-Suppressive Plants

Some plants actually have natural nematicides. This makes them great for eliminating root knot nematodes.

Some marigolds are among the best. These plants contain compounds that are toxic to certain species of nematodes. Planting them around the roots of susceptible plants will help prevent root-knot infestations.

Castor beans and certain varieties of chrysanthemums are also effective against these parasites. They contain compounds that are also toxic to some species of root-knot nematodes.

Black walnut is also a killer of root knot nematodes. This is due to the juglone present in the leaves and hulls.

5. Trap Crops

You can also plant carrots and tomatoes near susceptible plants. These vegetables will act as trap crops, drawing nematodes away.

6. Add More Organic Material to the Soil

Organic materials like compost, manure, and mulch can go a long way toward improving soil quality. This can help lessen the effects these bad nematodes have on your plants.

7. Remove the Root Tissue of Affected Plants

When you see a plant with root knots, remove all root tissues that could have come into contact with the nematode.

This is actually quite effective and will help avoid any further spread of these pests.

8. Till the Soil

Tilling the soil can also be an effective method for killing root knot nematodes.

As the soil turns over, it exposes the critters to sunlight, which will kill them. It also helps to aerate the soil.

If done correctly, tilling can help keep these pests at bay. However, you might need to reintroduce beneficial nematodes. Tiling will expose both good and bad nematodes to the elements.

9. Cover Crops

With this method, you will grow plants that are toxic to root knot nematodes. You’ll then chop them down and till them back into the soil.

Not only do these cover crops help suppress the population of dangerous nematodes in your soil, but they also help keep the soil nutrient-rich.

Marigolds, sorghum-sudangrass, cowpea, and jointvetch are all effective for this purpose.

10. Chitin

You may not have heard about chitin, but it can be one of your best allies when it comes to eliminating root-knot nematodes.

Chitin is found in the exoskeleton of arthropods and other organisms. It helps control these nematodes. It does so by supporting beneficial soil microbes that kill root-knot nematodes.

Chitin is available in many forms. You can purchase crumbled shrimp shells, which are a good source of natural chitin. You can also go for specially-formulated fertilizers that contain chitin as their active ingredient.

11. Wood Vinegar

This type of vinegar has proven to be effective in killing nematodes.

To use wood vinegar as a natural root knot nematode treatment, mix 10 ml of this vinegar with one liter of water.

Apply the solution to the soil to kill the pests. This home remedy will also encourage beneficial microbes.

12. Neem Oil

Neem oil also works against plant parasitic nematodes since they are so tiny. It will also kill nematode eggs.

Prepare diluted concentrate and apply it as a soil drench and/or foliar spray.

13. Hydrogen Peroxide

When it is mixed into the soil, hydrogen peroxide will kill all kinds of nematodes. It will also get rid of gnat larvae and other soil-dwelling pests.

Use hydrogen peroxide as a treatment for nematodes in the soil. Just mix 4 tablespoons of 3% hydrogen peroxide with 1 pint of water. Use this homemade solution as a soil drench.

14. Monterey Nematode Control

This product has an active ingredient that controls plant parasitic nematodes. It does so by hindering their development.

It  works great to protect tomato seedlings. The product suppresses dangerous garden nematodes that might affect the crop.

15. Molt-X

Molt-X contains azadirachtin. This ingredient helps to repel nematodes. It also affects their ability to feed properly.

Will Epsom Salt Work?

Epsom salt is effective against some pests like ants, termites, slugs, and armyworms. High doses will also kill earthworms in the soil.

However, it will not harm or deter root knot nematodes. So far, there have been no reports of it killing nematodes in the garden.


Root knot nematodes can be a challenge to control. But, with the right combination of natural treatments, strategies, and methods, you can keep them away.

Sasha Brown

Sasha Brown is a blogger and lover of all things natural.

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