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Beneficial nematodes are tiny, usually microscopic, roundworms
that can be applied to control caterpillars or grubs. Nematodes
move within moist soil and enter a suitable host. The nematodes,
along with an associated bacteria, kill the host within a few days.
How
to apply beneficial nematodes
- Select a nematode species that is most effective against the
target pest. Make sure you purchase nematodes from a reputable
supplier.
- Apply when the caterpillar or grub stage of the pest is present
and active. This can be throughout the late spring and summer
for most pests. For white grubs, apply later in the summer or
early fall when more mature larvae are present and active. A second
application about 2 weeks after the first will enhance control.
- Do not apply if the soil temperature is below 60°F.
- Irrigate before application. The soil must be moist, but not
soggy.
- Mix up a solution of fresh, infective stage nematodes in cool,
distilled water, pour the solution into a sprayer, and apply to
the infected area.
- Apply nematodes in the evening, especially in hot areas. Nematodes
are killed by light and heat.
- Irrigate after application. Several irrigations may be needed
to keep the soil moist.
- Follow up a week or so after each application. Look for red
or yellow-brown infected larvae or pupae.
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