October Colorado Insect checklist of some common insect-related events – Denver metro and Boulder, Denver South, and East
This is a generalized checklist of when some of the more important insect-related events tend to occur in our area. Year-to-year variations are considerable, and this should be used as a guideline to anticipate and help recognize common insect occurrences.
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DENVER METRO & BOULDER
Household/Miscellaneous
Fruit flies: Flies develop in overripe fruit and become abundant in homes.
Wasps and hornets: Nests are abandoned at the end of the season.
Boxelder bugs, conifer seed bugs, multicolored
Asian lady beetles: Invasions of homes accelerate with cool weather. Massing bugs occur on building sides during warm, sunny days.
Hackberry blister gall psyllids: Adults move into homes and to shelter of other overwintering sites.
Spiders, crickets: Movements into homes accelerate greatly with cool weather.
Tree/Shrub Insects
Aphids on trees: Overwintering eggs are laid as long as weather permits.
Poplar twig gall fly: Galls become obvious when aspen leaves fall.
Needle drop of pines: Pines naturally begin to shed third-year needles in fall.
Lawns
Cranberry girdler: Damage to lawns by this sod webworm occurs in the fall.
Clover mites: Egg hatch follows cold weather and mites begin to develop on grasses and weeds around foundations.
DENVER SOUTH AND EAST
Household/Miscellaneous
Vinegar flies/Fruit flies: Flies develop in overripe fruit and may become abundant in homes.
Wasps and hornets: Nests are abandoned at the end of the season.
Boxelder bugs, conifer seed bugs: Invasions of homes accelerate with cool weather. Massing bugs occur on building sides during warm, sunny days.
Multicolored Asian lady beetle, lacewings, root weevils: Invasions of homes occurs by insects looking for overwintering shelter.
Hackberry blister gall psyllids: Adults move into homes and to shelter of other overwintering sites.
Spiders, crickets: Movements into homes accelerate greatly with cool weather.
Tree/Shrub Insects
Aphids on trees: Overwintering eggs are laid as long as weather permits.
Poplar twig gall fly: Galls become obvious when aspen leaves fall.
Needle drop of pines: Pines naturally begin to shed third-year needles in fall.
Kermes scale: Typical period of crawler emergence
Lawns
Cranberry girdler: Damage to lawns by this sod webworm occurs in the fall.
Clover mites: Egg hatch follows cold weather and mites begin to develop on grasses and weeds around foundations.
Concerned about your lawn or tree health?
Call us at 303-806-TREE or click here to schedule your free plant health care consultation now!
