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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.
The blue spruce is attacked by two species of Adelges, an aphid-like insect that causes galls to form. Nymphs of the pineapple gall adelgid form galls at the base of twigs which resemble miniature pineapples and those of the Cooley's spruce gall adelgid cause cone-shaped galls at the tips of branches.
It is the primary pest of Norway Spruce. Another similar species, the Cooley spruce gall adelgid, is indigenous to North America. This adelgid usually affects Colorado Blue, Sitka, Englemann, and Oriental spruces. [4] The eastern spruce gall adelgid (Adelges abietis Linnaeus) is an introduced species that feeds only on spruce. At least in 1985 ...
Galls of Adelges abietis. Adelges is a genus of insects which feed on conifers. They have complex life cycles, some species feeding exclusively on spruce, others feeding on spruce and an alternate conifer. However, galls characteristic of each species are formed only on spruce. Six generations are usually needed to complete the 2-year cycle ...
Leaf galls. This is a list of insect galls arranged into families. ... Periploca ceanothiella ceanothus stem gall moth; Stagmatophora sexnotella dune blue curls;
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Siberian spruce Pinaceae (pine family) Picea omorika: Serbian spruce Pinaceae (pine family) Picea orientalis: Caucasian spruce Pinaceae (pine family) Picea polita: tiger-tail spruce Pinaceae (pine family) Picea pungens: blue spruce Pinaceae (pine family) 96 Picea purpurea: purple-cone spruce Pinaceae (pine family) Picea retroflexa: green dragon ...
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