November 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
Indian meal moth: Adults are most commonly observed flying about homes during early winter.
Fungus gnats: Adults begin to be observed around windows and around the soil of potted plants where they originate.
Boxelder bugs, conifer seed bugs, multicolored Asian lady beetles: Overwintering adults continue to be active in and around homes during warm days.
Fruit flies: Flies from overripe fruit continue to be present 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 accelerates with cool weather. Massing bugs occur on building sides during warm, sunny days.
Hackberry blistergall 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 twiggall fly: Galls become obvious when aspen leaves fall.
Oak bulletgall wasp: Adults begin to emerge late in month.
Needle drop of pines: Pines naturally begin shed of 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
Indian meal moth: Adults are most commonly observed flying about homes during early winter.
Fungus gnats: Adults begin to be observed around windows and around the soil of potted plants where they originate.
Boxelder bugs, conifer seed bugs, multicolored Asian lady beetles: Overwintering adults continue to be active in and around homes during warm days.
Fruit flies: Flies from overripe fruit continue to be present in homes.
Wasps and hornets: Nests are abandoned at the end of the season.
Boxelder bugs, conifer seed bugs: Invasions of homes accelerates 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 blistergall 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 twiggall fly: Galls become obvious when aspen leaves fall.
Needle drop of pines: Pines naturally begin shed of 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!
