Cooley Spruce Gall Adelgid

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Pest Profile Photo Credit: Whitney Cranshaw, Colorado State University, Bugwood.org Licensed under a Creative Commons Attribution 3.0 License Common Name: Cooley Spruce Gall Adelgid Scientific Name: Adelges cooleyi Order and Family: Hemiptera; Adelgidae Size and Appearance: Length (mm) Appearance Egg Eggs are oblong Covered with a protective cottony wax Laid near terminal buds Larva/Nymph Tiny, flat, oval Black in color with white, waxy, cotton- like threads along body margins on Douglas-fir trees Greenish gray in color and covered in a powdery wax on spruce trees Adult Winged and wingless ~ 1 mm Dark greenish black to black Gall Elongated and cone-like Length: 38-76 mm Found at base of new shoots Diameter: 17-19 mm Light green to dark purple in color Type of feeder (Chewing, sucking, etc.): Both larvae and adults have sucking mouthparts. Host plant/s: Spruce and Douglas-fir Description of Damage (larvae and adults): Feeding by nymphs on new shoots cause galls to form on needles as well as yellowing and twisting of needles. Damage is most severe in Christmas tree plantations due to the reduction of aesthetic value caused by unsightly galls on spruces and needle discoloration and deformation in Douglas-fir. First generation nymphs become “stem mothers” that are covered with a white, cottony wax covering that they lay their eggs under. These coverings result in reduced aesthetic value. References: Cranshaw, W. (2004). Garden insects of North America: the ultimate guide to backyard bugs. Princeton, NJ: Princeton University Press. Maine Department of Agriculture, Conservation and Forestry. (2000, April). COOLEY SPRUCE GALL ADELGIDAdelges cooleyi (Gill.). Retrieved April 05, 2017, from http://www.maine.gov/dacf/mfs/forest_health/insects/cooley_spruce_gall_adelgid.htm Saskatchewan Minstry of Environment. (2013). Forest Pest Fact Sheet: Cooley Spruce Gall Adelgid, Adeleges cooleyi and Spruce Gall Adelgid, Adelges lariciatus [PDF]. Regina, Saskatchewan: Government of Saskatchewan. .

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