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Identifying Invertebrate Pests—Fruit Development

On this page
  • Cankerworm
  • European earwig
  • European fruit lecanium
  • Fruittree leafroller
  • Green fruitworm
  • Katydid (from Madera south)
  • Obliquebanded leafroller
  • Omnivorous leafroller
  • Orange tortrix
  • Redhumped caterpillar
  • Western tussock moth

Names link to more information on identification and management.

Click on photos to enlarge
Identification tip: Cankerworms move along twigs and leaves in a characteristic inchworm fashion and have a habit of standing upright on their prolegs, remaining motionless so that they resemble a leafless twig.
European earwig
Identification tip: Earwigs feed on the surface of fruit causing shallow feeding injury.
European fruit lecanium
European fruit lecanium
Identification tip: The adult cover is domed, shiny brown, and about .25 inch in diameter with several ridges along the back.
Fruittree leafroller
Fruittree leafroller larva
Identification tip: Larvae are green with a black head; as they mature they turn darker green. These larvae are difficult to distinguish from the more damaging obliquebanded leafroller larvae. Larvae feed on leaves and buds, webbing them together to form a protective case.

Green fruitworm
Green fruitworm larva
Identification tip: Larvae are pale green caterpillars, often with whitish stripes down each side of the body and a narrow stripe down the middle of the back. Green fruitworms feed on young fruit, resulting in large corky lesions and distorted growth as the fruit enlarge.

Identification tip: The forktailed bush katydid is about 1.5 inches long from head to wing tip and has red line markings. Katydid nymphs have very long antennae that are banded black and white.

Obliquebanded leafroller
Obliquebanded leafroller larva
Identification tip: Larvae are are yellowish green with brown to black heads. Larvae feed on fruit early in the season leaving depressions.

Omnivorous leafroller
Omnivorous leafroller larva
Identification tip: Larvae are light colored with dark brown or black heads. When mature they are about 0.6 inch long and have two slightly raised, oblong whitish spots on the upper surface of each abdominal segment. They chew shallow grooves in fruit surfaces.

Orange tortrix
Orange tortrix larva
Identification tip: The orange tortrix larva is pale yellow or green with a light brown head. It has light colored round spots on each abdominal segment. Orange tortrix cause shallow feeding injury on the surface of fruit, especially where two fruit are touching.

Redhumped caterpillar
Redhumped caterpillar larva
Identification tip: The larva is easily recognized; the main body color is yellow and is marked by longitudinal reddish and white stripes; the head is bright red, and the fourth abdominal segment is red and enlarged. Redhumped caterpillars generally skeletonize leaves, leaving behind only leaf veins. They do not web leaves.

Western tussock moth.
Western tussock moth larva
Identification tip: The full-grown larva is generally gray in color with numerous colored spots, four prominent white tufts of hair on its body, and two black tufts on its head and one on its posterior end. Feeding results in shallow, scabby, depressed areas at harvest.


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