Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001744
11/12/99
Maple Bladder Gall Mite
Maple bladder gall mites are most common on silver maple
and to a lesser extent, red maple.
The mites overwinter in protected places in the bark on
tree trunks. In the spring they move to the developing
leaves. The mites feed on the underside of the leaves
which then form the galls that enclose the mites. The
mites lay eggs which hatch and the offspring go to other
leaves and cause formation of new galls. By mid-summer
the mites have stopped causing new galls.
The galls are round and can be green, red, or black. The
leaves closest to overwintering sites are most heavily
infested.
The tree is not seriously harmed so no controls are
suggested.
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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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