Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000810
11/12/99
JUNIPERUS INSECT PROBLEMS
Bagworm (Vis. 2) lives in a two to three inch long sack
(Vis. 1) built from needles. The insect overwinters as an
egg in the sacks of the females. The injury consists of
feeding on the foliage with most of the injury near the top
of the tree. Control by hand-picking the bags in winter.
Juniper scale causes yellowed needles, and infested
branches fail to produce new growth. The scale is round
and at first white, later turning gray or black. Crawlers
are controlled with properly timed sprays.
The juniper webworm webs twigs and needles together,
causing them to brown and die. The larva is 1/2 inch long
and is brown with darker stripes. The larvae are often in
the densest part of the plant and can go unnoticed.
Elongated white flecks on the needles may be Pine Needle
Scale. The insects suck juices from the foliage causing it
to become discolored. Heavy infestations will reduce tree
health. Dormant oil sprays in late fall or early spring will
control the problem.
Spider mites cause older needles to lose green coloration
and become yellowed. The insects are very small and
difficult to see so infestations can become severe before
being noticed.
Related information.
Pesticide Recommendations
Pine Needle Scale
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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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