how does a sod webworm damage things?

I need help with this question!! I have something that is do tomorrow and this is the only thing I don't have done! So someone please help! I have looked all over google and I have found nothing

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  • 6 years ago
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    Sod webworm larval damage often is observed as brown patches up to the size of a baseball in the lawn. In some instances, the brown patches are punctured with pencil-sized holes a result of birds searching for the webworm burrows. Feeding damage from sod webworm larvae frequently goes unnoticed during periods of drought. The most severe damage usually occurs in July and August. Larvae chew off leaves and stems just above the crown. As webworm larvae continue to grow and feed, the injured areas enlarge and coalesce into big, brown patches. The economic threshold for sod webworm larvae has been suggested to be 4 to 6 per square foot but can be variable. Fine fescue, Kentucky bluegrass, and other grass species are susceptible to larvae. Areas frequently infested include steep slopes, banks, and other locations that are difficult to water. Another good indicator of fresh sod webworm larval feeding is the presence of moist, fresh, green fecal pellets in the thatch. Damage caused by dogs may be confused with sod webworm damage. Dog urine on a lawn produces a small patch of yellow grass. This patch may turn brown and die later, but the border of the patch will be very green and there will be no signs of grass having been clipped. Sod webworm spots are not bordered by rich, green grass and do not yellow before turning brown.http://ento.psu.edu/extension/factsheets/sod-webwo...

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