Q:

What does grub treatment do for lawns?

A:

Quick Answer

Grub treatments can end up saving lawns, because grub infestations often destroy the root systems for grass, leaving behind a spongy area with no connection to the soil beneath. Signs that grub treatment is necessary include patches of dead grass in the spring and fall.

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Full Answer

Other signs that grubs have invaded a lawn include moles, crows and skunks showing up to eat the grass, because they enjoy feasting on the grubs. Moles also eat insects and earthworms that have set up residence on shallow root systems for trees, so their presence is not a guaranteed indicator of grub.

Testing for grubs involves taking a square foot of soil and grass, up to 4 inches deep, from different parts in the yard. Looking through the soil, grass and associated debris is the best way to look for grubs, and if no grubs turn up, putting the sod back in place and packing it in, following up with some water, helps the sod reattach quickly.

The best time to test is during August or the first week of September, as the insecticide to get rid of grubs is most effective during that time. If there are more than five grubs per square foot, insecticide is necessary to help preserve the health of the lawn.

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