IPM Scouting in Woody Landscape Plants
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| Cooley spruce gall adelgid - Adelges cooleyi | |||||
| IPM scouting in woody landscape plants > cooley spruce gall adelgid | |||||
| This insect can produce continuous generations on either Colorado spruce or Douglas-fir but normally spends a portion of its two-year life cycle on each host. Overwintering females on spruce lay eggs near developing buds. Nymphs hatch as bud caps split. Nymphs feed at the base of developing buds in spring producing cone-like galls on the tips of blue spruce branches. Galls open in mid-summer. Emerging adelgids either continue to live on spruce or fly to Douglas-fir to lay eggs. On Douglas-fir they may continue to live or produce a generation that flies back to spruce to produce the gall-forming stage. On Douglas-fir, feeding on needles by nymphs produces yellow spots and curled needles but no galls. |
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| This information was developed from A Pocket IPM Scouting Guide for Woody Landscape Plants by Diane Brown-Rytlewski. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2839). | |||||
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