Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001304
11/12/99
SALIX INSECT PROBLEMS
Aphids cause deposits of honeydew on lower leaves.
Spraying large trees may not be necessary as predatory
insects will bring the aphid population down.
Imported willow leaf beetles (Vis. 1) are metallic blue and
the larvae are black. The larvae do most of the feeding on
leaves. The adults eat the entire leaf while larvae
skeletonize the leaves. There are two generations per
year.
Lace bugs cause mottling and yellowing of the leaves.
The insects are small, found under the leaves, and have
transparent wings with dark veins.
Poplar and willow borer bore in the trunk and may be
serious on newly planted trees. In spring the insects
expel frass through openings in the trunk. The frass
clings to the bark. Spraying may be done in late fall or
early spring and should be applied to large limbs and the
trunk.
Related information.
Pesticide Recommendations
Aphids on Ornamentals
Imported Willow Leaf Beetle
Lace Bugs
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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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