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Pineapple gall adelgid on spruce trees


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Symptoms

Adelgids are related to aphids, but are confined to conifers. The pineapple gall adelgid feeds on the sap of spruce trees. Small green or brown pineapple-like galls develop near the shoot tips on spruce. Normal shoot extension may be checked during the summer but often continues once the insects have vacated the galls.

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Young nymphs overwinter on spruce trees, and lay eggs covered in white woolly wax. Young adelgids hatch within a few weeks (around May) and feed at the base of young leaves and tips of young shoots. In early autumn the galls open to release winged adelgids.

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