Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001756
11/12/99
Eastern Spruce Gall Adelgid
The insect overwinters as a female. The female lays eggs
near the base of a new shoot. The eggs hatch in about 10
days and the offspring eventually feed near the base of
the needles causing it to enlarge (Vis. 1) and surround the
insects. The insects remain in the gall (Vis. 2) until it
opens up in mid- to late-summer. The insects emerge and lay
eggs. The eggs hatch and the immature females settle near a
bud to spend the winter.
The galls formed by this insect are located at the base of
the new growth. The galls weaken the branch and reduce
the ornamental value of the tree.
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This file was generated from data base ZZ on 01/19/00.
Data base ZZ was last revised on 11/12/99.
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