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 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.

Oak bullet gall wasp: Adults begin to emerge late in the month.

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

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 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!