The Insects of September

Boxelder bugs, Cluster flies - Overwintered adults become active in and around homes.

Clover mites - Migrations of mites from lawns into the south sides of buildings begin on warm days.

Firewood insects - Bark beetles and wood borers emerge from stored wood in homes.

Ants - Foraging field ants hunt for sweet materials in homes.

Oystershell scale - Scrape egg-laden scales off the limbs of aspen and other plants with no-scratch, kitchen scrubbing pads.

Poplar twiggall fly - Larvae leave the galls to pupate in soil at the base of tree.

Dormant oils - Now is the time to apply dormant horticultural oils to control many insects (scales, aphids, and others) that overwinter on the bark and twigs of trees and shrubs.

Pinyon needle scale - Females produce cottony egg sacks on branches and trunks.

Engraver beetles - Engraver (Ips) beetles may be active in warm periods. Protect recently transplanted pines.

Southwestern pine tip moth - Adults emerge from pupae at the base of trees.

Spider mites on arborvitae - Watch for population increases of this particular arborvitae spider mite.

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

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