Your August Colorado Insect Checklist

Your August Colorado Insect Checklist

August Colorado Insect checklist of some common insect-related events – Denver, South and East

 This is a generalized checklist of when some of the more important insect related events tend to occur in the South and East Counties area. Year to year variations are considerable, and this should only be used as a guideline to anticipate and help recognize common insect occurrences.

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!

Early August

Tree/Shrub Insects

Honeylocust spider mite: Populations increase rapidly and cause leaf bronzing.
Peach tree borer: Second treatment may be of benefit if heavy flights persist. Monitor with pheromone traps.
Asian Longhorned Beetle (ALB): particularly active this time of year. Take a 10-minute walk around your yard or neighborhood and inspect your trees. If you see any signs, report them here.

Garden Insects

Aster yellows: Peak period of transmission by infective leafhoppers.
Tobacco (geranium) budworm: Damage to geraniums and petunias accelerates in August.
Whiteflies: High populations may be present if infested transplants were used in the garden. Grasshoppers: Increased number of adults present; migrations to gardens accelerate.
Cane borers in raspberries: Wilting symptoms are not most evident at this time of year due to cane boring insects.
Miscellaneous Yellowjackets: Nest size and nuisance problems greatly increase over the next month.

Late August

Household Insects

Cluster flies: Flies begin to move to buildings seeking overwintering shelter. Seal buildings to avoid later problems.
Yellowjackets: Nest size and nuisance problems accelerate.

Tree/Shrub Insects

Elm leaf beetle: Feeding injury by the second generation becomes visible.
Honeylocust spider mite: Populations normally begin to decline.
Walnut twig beetle: Adult may begin to move to trunk and excavate overwintering chambers. Trunk treatments may be initiated now.

Garden Insects

Potato/tomato psyllid: High populations often occur on tomato in late summer.
Twospotted spider mite: Expect highest populations and greatest injury at this time.
Grasshoppers: Migrations to gardens accelerate and may peak.


 

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!

Want more seasonal tree care updates? Check out our Tree Care Calendar or subscribe to our seasonal newsletter.

 

 

Source: CSU Ext (pdf)

 

last updated

Jun 8, 2017 @ 2:04 pm

 

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2017-06-08T14:04:16-06:00