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Other Pests You May See—Fruit Development

Names to more information on identification and management.

Click on photos to enlarge
Larva of the spring cankerworm, Paleacrita vernata.
(not usually damaging)
Identification tip: A cankerworm moves by arching its back in a characteristic inchworm fashion.
Fall webworm larvae feeding inside a silken tent that they enlarge as they consume foliage.
Fall webworm
(not usually damaging)
Identification tip: Caterpillars feed inside silken tents, enlarging the tents to cover more food as available food is consumed.
Larva of forest tent caterpillar.
Tent caterpillars
(not usually damaging)
Identification tip: Caterpillars form mats or tents of webbing but feed outside the tent on leaves.
Redhumped caterpillar damage.
Redhumped caterpillar
(not usually damaging)
Identification tip: Caterpillars are yellow with black spots and the fourth abdominal segment is enlarged into a red hump.
Tree Borers
American plum borer larvae boring in scaffold crotches of young trees.
American plum borer

Identification tip: Extensive gumming around scaffold crotches, at pruning wounds, or in crown galls can indicate the presence of this borer.
Rough, broken bark caused by Pacific flatheaded borer larvae.
Pacific flatheaded borer

Identification tip: Rough, broken bark on a young tree can signify that a larva is feeding under the bark.
Shothole borer adult emergence holes.
Shothole borer

Identification tip: Tiny, circular holes about 1/16 inch in diameter are created when adults emerge from the tree.
Wilted dying leaves due to an adult branch and twig borer, Melalgus (=Polycaon) confertus, burrowing near the shoot base.
Branch and twig borer
Identification tip: Small, round holes at the axils of small twigs or branches are caused by adult females. Branches usually die from larval feeding.
Peachtree borer infestation on tree.
Peachtree borer

Identification tip: Look for small piles of gum mixed with frass around a tree base.
Pale, sparse foliage on tree with Phytophthora crown rot.
Phytophthora root and crown rot

Identification tip: Sparse, pale foliage can indicate Phytophthora. Cankers can be found in the bark at the crown area.
Tree damaged by bacterial canker.
Bacterial canker
Identification tip: A dead branch can signify bacterial canker. Look for substantial gumming on the bark surface.
Pale foliage on one side of young cherry tree infected with Armillaria.
Armillaria root rot
(oak root fungus)
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.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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Agriculture and Natural Resources, University of California

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