Dead patches of grass occurring in July and early August may indicate sod webworm presence. An abundance of birds in the early morning on lawns may also signify sod webworm nearby.
Control is lightly watered in as opposed to deep watering for grubs. Check the current University of Illinois Urban Pest Control Manual for recommendations.
Sod webworm damaged turf comes out of the turf "like hair from a shedding dog".
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