What is the best time to apply nematodes?



Nematodes should be applied when light levels are low. They are light sensitive, so apply them in the very early morning or at dusk.

When can nematodes be applied?

In general, you can apply nematodes in early spring once the soil is no longer frozen. We recommend applying at dusk, to protect the nematodes from UV light and drying out. Water the area to be treated well both before and after nematode application.

How long does it take nematodes to work?

Beneficial nematodes kill individual pests within 48 hours, but it will take about two weeks for a noticeable decrease in pests. The nematodes need time to consume one host and reproduce, then move on to the next one and repeat the whole process over and over again for each pest.

What is the best way to apply nematodes?





You can apply them using a watering can, sprayer and hose attachment or misting system. It’s a good idea to apply your nematodes during low light periods (morning or evening are best). It is very important that you mix and apply your nematodes quickly so they don’t ‘expire’ in the can.

How do you know if nematodes are working?

You can see results immediately. Using a spade or shovel, turn up the ground where nematodes were applied, to check for dead larvae. Once you have seen dead larvae, this tells you that the nematodes are working.

Can I apply nematodes in March?

Nematodes are recommended for use whenever larvae or grubs are present. Generally, this is during spring and autumn.

Can I apply nematodes in winter?

Nematodes should be applied in morning or evening when soil temperatures are 42°F – 95°F. Beneficial nematodes remain effective up to 95°F, but no longer parasitize prey above that. Please Note: one hard freeze will not harm beneficial nematode populations; however, prolonged freezing temperatures will.

Can you cut grass after applying nematodes?





It is recommended to leave it a couple of days after application to ensure the Nematodes have worked their way into the soil, you can then add topsoil. When can I cut my lawn after applying Nematodes? We would advise to wait a couple of days for the Nematodes to enter the soil before cutting the lawn.

Can I apply nematodes in the rain?

Nematodes travel ONLY through water particles so it is very important to make sure that your lawn is thoroughly wet before application (after a good rain is best). If it hasn’t rained, you need to put out a sprinkler for a good length of time to ensure the ground is moist.

How many nematodes do I need?

BioLogic recommends 13,000-35,000 nematodes per square foot. This number varies a bit depending on the pest, so check out our website or contact us for specific application rates for your pest. Our recommendation is based on our research, and the research of reputable institutions like Cornell University.

How soon can I fertilize after applying nematodes?

Because of its high nitrogen content, fertilizers can limit nematode effectiveness. Generally, manufacturers recommend that fertilizers not be used two weeks before and after nematode application. Check the package instructions.

How long do beneficial nematodes last?

Beneficial Nematodes hunt down, penetrate, and kill most soil dwelling pests. They will remain effective for about 2 years, but annual applications are recommended.



Can I use a pump sprayer to apply nematodes?

Nematodes can easily be applied with a watering can, a hose end sprayer or a pump sprayer—please note there are different directions for each application method (see below).

When should I treat my lawn for Leatherjackets?

When should you treat for Leatherjackets? The optimal treatment time for Leatherjackets is between mid-September to October. Leatherjackets usually have a one-year life cycle which starts when the female lays her eggs in the lawn around September, they hatch 2-3 weeks later.

Can nematodes survive a freeze?

A few species of nematodes can survive extensive intracellular freezing throughout all their tissues, an event that is usually thought to be fatal to cells.

Can I apply nematodes in the summer?

How to Apply Nematodes

What time of year do you spray nematodes?

When do I apply them? Nematodes are most effective when the soil temperature reaches about 15C. This is weather dependent year to year but it is usually around mid May. When you see them available in your local garden centers, it is the correct time to apply them, not before.



Can nematodes survive a freeze?

A few species of nematodes can survive extensive intracellular freezing throughout all their tissues, an event that is usually thought to be fatal to cells.

How often apply beneficial nematodes?

Additionally, if you apply at high enough levels you can often get away with just one application per season rather than needing to reapply once some of the nematodes die off (depending on a number of factors including temperature, pest population and soil conditions).

Do beneficial nematodes survive winter?

Beneficial nematodes go dormant during the winter, and can survive until spring. However, in climates with harsh winters (like ours here in Minnesota), many of them will die off.

Can you fertilize after applying nematodes?

Generally, manufacturers recommend that fertilizers not be used two weeks before and after nematode application.

What temp kills nematodes?

Pump pressure and temperature above 300 pounds per square inch and 85°F, respectively, will kill nematodes.