Species
Adelges cooleyi (Douglas fir adelgid)
Adelges cooleyi. Photo: (c) Matthias Buck, some rights reserved (CC BY-NC)
The gall adelgid (Adelges cooleyi) is an adelgid species that produces galls in spruce trees. They infect the new buds of native spruce trees in the[foothills of the Rocky Mountains in the spring. They also attack blue spruce to a lesser degree. The insects complete two generations within the year. They require two different trees for its life cycle, the second being the Rocky Mountain Douglas-fir. They may also attack Sitka, Engelmann, or white spruce. The…
Sightings
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