The Insects of June

Miller moths: Migrate across the Front Range on their annual plains to mountain migration.

Strawberry root weevil: When hot weather begins, adults begin to wander into homes.

Cottony maple scale: Females swell and produce conspicuous egg sacks.

Spruce spider mites: Peak populations this month.

Striped pine scale: Crawlers emerge this month.

Pinyon spindlegall midge: Adults emerge and lay eggs at the base of needles.

Rose leafhoppers: Peak injury to rose foliage.

Poplar borer: Adults begin to emerge from aspen in late June.

Douglas fir tussock moth: Typical peak period of injury. Monitor infested spruce.

Peach tree borer: Adult flights begin. Protective sprays timely now.

Cooley spruce gall adelgid: First emergence from spruce galls and migration to fir.

Honeylocust spider mite: Populations begin to increase to mid-summer peak with onset of hot weather.

Elm leaf beetle: Injury by first generation apparent.

Honeylocust plant bug: Late this year but now crawling.

European elm scale: Eggs hatch and crawlers settle on leaves.

Mountain pine beetle: Optimal time for treatment for most areas.

Pinyon pitch mass borer: Adult emergence begins.

Potato/tomato psyllid: Flights will begin in late month to newly planted tomatoes.

Colorado potato beetle: Peak period for egg laying on potato and eggplant in late month.

Flea beetles: Populations will peak on new vegetable and flower transplants before hot weather begins. Watch for typical shothole feeding injury.

Twospotted spider mite: When the heat sets in, populations begin to build.

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