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.
Information courtesy Whitney Cranshaw, Department of Bioagricultural Sciences and Pest
Management, Colorado State University.
