With fall webworms, Bt is effective only if its application is properly timed. Once the caterpillars have enshrouded themselves in webs, they are more difficult to kill.
Sod Webworms
Sod webworms cause dead spots by severing grass blades and pulling them into the ground to eat. They prefer new lawns.
Fast fix: Apply BTK about two weeks after moths appear, when pests are in their larval stage.
Fall Webworm
Symptoms: Chewed leaves; in summer and fall, silky webs appear at the tip end of branches, with larvae visible inside.
Offenders: Adult webworms, about 1 inch long with a dark stripe down their backs.
Young webworms are caterpillars, measuring about one-quarter to one inch in length. They are brown or gray and with rows of dark spots on their backs. During the day, young webworms live in silk-lined tunnels in thatch and the surface of the soil.
Parasitic nematodes are microscopic worms whick seek out and then eat their way into the bodies and killing many soil dwelling pests including grubs, weevils and webworms.
Bagworms Birch Borers Vinca Blight Copper Deficiency Crab Grass Cucumber Beatles Cutworms Crown Gall Cucumber Beatles Cutworms Dog Injury Dormant Oil Dried Blood Eastern Tent Caterpillar English Ivy & Brickwork Euonymus Scale Fall Webworms Flickers ...
The most common are the Eastern and Western tent caterpillars, fall webworm and euonymus caterpillar.
Look-alikes: Often mistaken for the gypsy moth. Plants attacked: Different species feed on different plants.
Fleas, caterpillars, cutworms, sod webworms, worker/soldier ants, worker/soldier termites, American cockroach, armyworm, artichoke plume moth, Asian cockroach, beet armyworm, black cutworm, bluegrass weevil, codling moth, corn earworm, ...
Some of the most important are the fall webworm and the walnut caterpillar. Watch for infestations of these pests.
The most common above-ground insect pests in Virginia lawns are chinch bugs and sod webworms; both feed on grass leaves and stems.
Host pests include various species of aphids, garden webworm, tomato hornworm, armyworms, strawberry leaf roller, and tent caterpillar, among others.
Use a disclosing solution to bring the sod webworms and other insects to the surface. Mix one-fourth cup of dry laundry detergent in a gallon of water and sprinkle on one square yard of lawn.
Plan for diligent monitoring for insects, including bluegrass billbug, sod webworm and chinch bug. Irrigate as needed. Continue spot lawn herbicidal or hand-pull weed treatments.
August and September: ...
The adults feed on large caterpillars, such as tomato hornworms, walnut caterpillars and fall webworms, by piercing them and sucking them dry. They will not bite humans readily, but when they do, the bite is very painful.
 See also: Insect, Plant, Leaf, Grass, Lawn
  
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