Adelges cooleyi (Hemiptera: Adelgidae)
Cooley Spruce Gall Adelgid
Deming, Whatcom County, Washington
September 10, 2012

Douglas fir needle with dead adelgid female and her young. The young adelgids were hatched from eggs and sheltered under their dead mother's wings and abdomen. These adelgids will feed on the Douglas fir. Some of this generation will develop wings and fly to a spruce, where they will overwinter in preparation for laying eggs in the spring. The generation that lives on the spruce will cause galls, but no galls are induced by the adelgids on Douglas firs.