The Insects of July

Sun spiders and Strawberry root weevils: Moving into homes with hot weather.

Peach tree borer: Egg laying begins and time to start preventive sprays.

Elm leaf beetle: The first of two or perhaps three generations become full grown and move down the trunk to pupate.

Black vine weevil: Adults notch the leaves of euonymous and rhododendron.

Leafcutter bees: Cut out leaves on roses, lilacs and other plants indicatestheir presence.

Cooley spruce gall: Peak emergence from galls and migration to Douglas fir.

Pinyon pitch mass borer: Adult emergence continues and egg laying begins.

Mountain pine beetle: Adult emergence begins.

Codling moth: Second and most damaging generation begins to lay eggs
in late July.

Pearslug: Larvae damage plum and cotoneaster.

Elm aphids: Excrete a large amount of honeydew on leaves.

Apple maggot: Expect the emergence of adult flies and onset of egg laying.

Mexican bean beetle: Larvae begin to damage beans.

Colorado potato beetle: Peak period of larval injury and end of 1st generation.

Tomato hornworms: Peak damage by larvae occurs over the next month.

Potato/tomato psyllids: Yellow or purple new growth symptoms begin to appear on infected plants. Spray when green, disk-like insect larvae first detected on the backs of leaves.

Tobacco budworm: Early evidence of injury to geraniums, petunias and nicotianabegins to appear.

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

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