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Pests and Their Damage—Fruit Development

On this page
  • Caterpillars
  • Aphids
  • Peachtree borer
  • European earwig
  • Western flower thrips
  • Powdery mildew
  • Brown rot and Botrytis infections
  • Phytophthora root and crown rot
  • Gophers

Names link to more information on identification and management.

Click on photos to enlarge
Caterpillar damage

Damage caused by fruittree leafroller
Fruittree leafroller damage
Identification tip: Larvae feed on leaves, often webbing them together; fruit feeding (not shown) is usually shallow.

Damage caused by green fruitworm
Green fruitworm damage
Identification tip: Green fruitworm may chew deep holes in green fruit.

Other invertebrates

Damage caused by black cherry aphid
Black cherry aphid damage
Identification tip: Feeding causes curling and distortion of leaves.

Damage caused by peachtree borer
Peachtree borer damage
Identification tip: Gum mixed with frass can be found around the base of trees with an active peachtree borer infestation.

Damage caused by earwigs
European earwig
Identification tip: Feeding damage on fruit results in shallow, irregular holes.

Damage caused by western flower thrips
Western flower thrips damage
Identification tip: Egg laying by thrips causes dimples on the surface of green fruit.


Damage caused by powdery mildew
Powdery mildew damage
Identification tip: Powdery mildew appears as whitish fungal growth on leaves; leaves may become distorted.

No photo available.

Brown rot fruit damage
Identification tip: Fruit damage first appears as small, dark spots on the fruit surface. Dark brown discoloration spreads rapidly; grayish brown tufts of spores develop on the surface of the rotted area.

Phytophthora root and crown rot on cherry trunk
Phytophthora root and crown rot damage
Identification tip: The wood of a Phytophthora canker is dark, reddish brown, often with a zonate margin.

No photo available.

Botrytis damage
Identification tip: Brown decay develops on fruit, and light brown or gray spores cover the surface. Infected fruit become watery and soft.


Gopher signs
Gopher damage
Identification tip: Gophers form conspicuous mounds of dirt on the orchard floor. Burrow openings are plugged with soil.


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