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CUES: Center for Urban Ecology and Sustainability

Diagnosis Case: Oak

Sometimes the quickest way to diagnose insect problems is to identify the actual insect. See the tables and pictures below. You can study the lifecycle and determine what times of year each insect or insect stage is present.

Type of Insect No. of Generations Insect Stage Time they are present
Cankerworm 1 LarvaeApril - Mid-June (Fall and Spring Cankerworms)
Adultslate October (Fall Cankerworm), late March (Spring Cankerworm)
Flatheaded Apple Tree Borer1 Larvae follow adults emerging through the summer
AdultsMay - Summer
Kermes Scale 1 eggslate June and July
Adult femalepresent in same place from onset
Gypsy Moth 1 Larvaeearly to mid-May
Adultslate June - late July

Adult flatheaded appletree borer Adult lace bug guarding eggs
Adult cankerworm female
Adult cankerworm male
Cankerworm larvae
Gypsy moth (all stages)


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Last modified on March 06, 2013