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.
