The Insects of August

Honeylocust spider mite: Populations can rapidly increase and cause leaf bronzing. Populations normally decline late in the month.

Peach tree borer: A second treatment may be of benefit if heavy adult flights persist.

Aster yellows: This is the peak period for transmission by the leafhopper vector.

Tobacco (geranium) budworm: Damage to geraniums and petunias accelerates in August.
Whiteflies: Large numbers may be present if infested transplants were set out.

Cane borers in raspberries: Wilting symptoms are most in August heat.

Yellowjackets: Expect nest size and nuisance problems to increase over the next month.

Elm leaf beetle: Second generation feeding damage becomes visible.

Dagger moth: Larvae feed on maple leaves and clip petioles.

Zimmerman pine moth: Adults emerge to lay eggs and eggs hatch in late
month. This is the first opportunity for treatment.

Kermes oak scale: Insects develop rapidly and twigs flag by late month.

European elm scale: Foliage yellows on heavily infested branches.

Corn rootworms: Adults feed on late planted corn, clipping silks.

Potato/tomato psyllid: Look for increasing populations of nymphs on the undersides of tomato and potato leaves.

Twospotted spider mite: Expect the highest populations and greatest injury by late month.

Provided courtesy of Colorado State University Cooperative Extension Photographs courtesy of Judy Sedbrook.

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