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Adelgids (Adelges cooleyii, A. lariciatus, A strobilobius, Pineus pinifoliae, P. similis) are soft-bodied insects closely related to aphids.
Old galls (top) and newly forming galls (bottom) are
evidence of an infestation of Cooley spruce gall adelgids
The first generation feeds on the succulent new needles at the branch terminals. The insect injects a hormone during feeding which closely mimics plant hormones responsible for cell division.
The tree responds by forming a gall at these feeding sites. The young adelgids enter this gall and are sheltered inside it through their growth cycle.
Cultural or Non-chemical Controls:
For more information on chemicals available for control of these pests, call Agriculture Canada's Pesticides Directorate in Ottawa (toll-free) at 1-800-267-6315. Chemical pesticides may be toxic to humans, animals, birds, fish, and beneficial insects. Follow all label instructions and precautions listed by the manufacturer.
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