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Plum
> Year-Round IPM Program > Fruit
Development > Other Pests
Plum
Other Pests You May See—Fruit Development
Names link to more information on identification
and management.
Click on photos to enlarge
Caterpillars and Katydids
Fall webworm
(not usually damaging)
Identification tip: Caterpillars feed inside silken tents, enlarging the tents to cover more food
as available food is consumed. |
Redhumped
caterpillar
(not usually damaging)
Identification tip: Caterpillars are yellow with black spots and the fourth
abdominal segment is enlarged into a red hump. |
Tent
caterpillars
(not usually damaging)
Identification tip: Caterpillars form mats or tents of webbing but feed
outside the tent on leaves. |
Obliquebanded leafroller
Identification tip: Larvae are yellow-green caterpillars. When disturbed,
they wiggle backwards and drop to the ground on a silken thread. |
Orange tortrix
Identification tip: Orange tortrix larvae are light-green caterpillars
with brown heads. When disturbed, the larvae wiggle backwards and drop to the
ground on a silken thread. |
Katydids
Identification tip: Katydids resemble grasshoppers but have long antennae. |
Tree Borers
Pacific flatheaded borer
Identification tip: Rough, broken bark on a young tree can signify that a larva is feeding under
the bark. |
American plum borer
Identification tip: Extensive gumming around scaffold crotches, at pruning wounds, or in crown
galls can indicate the presence of this borer. |
Shothole borer
Identification tip: Tiny, circular holes about 1/16 inch in diameter are created when adults emerge
from the tree. |
Diseases
Phytophthora root and crown rot
Identification tip: Sparse, pale foliage can indicate
Phytophthora. Cankers can be found in the bark at the crown
area. |
Bacterial
canker
Identification tip: A dead branch can signify bacterial canker. Look for substantial gumming on
the bark surface. |
Armillaria root rot
Identification tip: Leaves often turn pale and wilt, usually on one side of the tree. White fungus
can be seen if the bark is peeled from the trunk where it meets the soil. |
Birds
Bird damage
Identification tip: Look for pecked fruit. |
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