Beneficial Nematodes

Bradford Greenhouses Blog

Does your lawn have grubs or bugs? Looking for a chemical-free way of getting rid of them? Nematodes may be your answer. Since applying nematodes is new to many home gardeners we have put together some information for you.

What are Beneficial Nematodes?

Nematodes are one of the most abundant groups of living creatures in the world. They look like thread-like round worms that are microscopic.


Why use Beneficial Nematodes?

For those of you who want to use something that is organic you can choose to use Beneficial Nematodes. They are nature’s way of helping us keep our lawn and garden looking beautiful each season. They are 100% organic and safe for children, pets and plants.

How do they work?

Once in the soil they can survive up to 90 days or more. They actively seek out insects that live in the soil and they help control over 250 different garden pests such as Grubs, Sod webworms, Beetles, Chafers and Garden Slugs as some examples. Once the Nematode locates a garden pest that you are trying to treat, it will kill it by releasing a bacteria, reproduce within it and the offspring will exit in search of more insects, repeating the cycle again.

When to Apply Nematodes?

Nematodes need to be applied in Spring and Fall and when the soil temperatures are around 10 °C. An evening application is best or when the weather is cloudy and cool. Hot, dry weather may prevent the nematodes from surviving. Re-application at the start and end of every season is key for ongoing maintenance and success. It is recommended to wait 2 weeks before and after the application of Nematodes to apply fertilizer.

How to Apply Nematodes?

Since Nematodes are living things it is important to apply them as soon as possible. If storage is needed, it is recommended that they are refrigerated at approximately 4 °C. It is best to follow the mixing instructions on the package purchased. Nematodes that are packaged in a sponge are rinsed from the sponge into a small amount of water (1-4 litres); this becomes your concentrated solution.


You can then apply them by diluting your solution with hose-end sprayer or watering can. They will settle in standing water so you will have to agitate the water before application. You must remember to remove any filters that nematode/water solution will pass through. It is key to keep your lawn moist after application as this aids in the ability of the Nematode to move around.

How much coverage will be achieved?

Coverage will depend on how heavily you apply your nematodes. Here is a guideline for you:

1 million – covers between 2000-3000 sq. feet.