Stunted, yellow cornstalks that are prone to toppling over are the most serious damage caused by corn rootworms.
These beetle larvae are 1/2–3/4″ white grubs that tunnel into the roots of corn plants to feed.
Adult beetles also feed on corn silks, pollen, tassels, and occasionally, leaves. One type of rootworm beetle may target the flowers and leaves of squash-family plants and beans as well, especially in late summer. Corn rootworms are most likely to be a problem in gardens where corn has grown for two seasons or more.
There are three different species of this pest:
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