UC IPM Online


Pests and Their Damage During Fruit Development

On this page
  • Twospotted spider mite
  • Pear rust mite
  • Pearleaf blister mite
  • European red mite
  • Codling moth
  • Obliquebanded leafroller
  • Stink bug
  • Western boxelder bug
  • Lygus bug
  • Katydid
  • Pear psylla
  • Pear slug
  • Mealybug (grape, obscure)

Names link to more information on identification and management.

Click on photos to enlarge
Mites Mite damage
Twospotted spider mite
Twospotted spider mite adult
Identification tip:  Greenish to yellow globe-shaped bodies with conspicuous dark spots.
Leaf burn resulting from feeding by webspinning spider mites.
Twospotted spider mite damage
Identification tip:  Blackening of pear leaves.
Pear rust mites
Pear rust mites
Identification tip: Tiny, wedge-shaped bodies. Adults pale white to cream colored during the growing season.
Damage caused by pear rust mite.
Pear rust mite damage
Identification tip: Localized uniform russeting on fruit.
Pearleaf blister mite
Pearleaf blister mites
Identification tip: Tiny with a white, long, slender, and striated body inside leaf blister. Immature form resembles adult but smaller.
Damage from pearleaf blister mite
Pearleaf blister mite damage
Identification tip:Leaf blisters, 1/8- to 1/4-inch across, first red and later blacken.
European red mite
European red mite adult
Identification tip: Dark red with white spots at the base of 6 to 8 hairs on the back.
European red mite damage
European red mite damage
Identification tip: Stippled and bronzed leaves that may turn brown and dry.
European red mite nymph
European red mite nymph
Identification tip:  Immature mites are bright red.
European red mite nymph
European red mite eggs
Identification tip: Globe shaped and red with a slender stalk (stipe) rising from the top center.
Caterpillars—Top of page Caterpillar damage
Codling moth larvae
Codling moth eggs and larva
Identification tip: Eggs disk shaped. Newly hatched larva white with black head.
 Codling moth damage
Codling moth damage
Identification tip: Fruit tunnel plugged with frass. Calyx entries difficult to detect without cutting the fruit.
Codling moth mature larva
Codling moth mature larva
Identification tip: Mature larva 1/2 to 3/4 inch long, pinkish white, with mottled head.
Obliquebanded leafroller
Obliquebanded leafroller larva
Identification tip: Greenish yellow with brown to black head.
Obliquebanded leafroller damage
Obliquebanded leafroller larval damage
Identification tip: Superficial feeding on fruit under leaves tied to fruit, or where two fruit touch.
Plant bugs—Top of page Plant bug damage
Consperse stink bug adult
Stink bugs adult and egg mass
Identification tip: Shield-shaped body; species may differ in color and size (consperse shown here). Eggs (left) barrel shaped, laid in clusters.
Stink bug damage
Stink bug and western boxelder bug damage
Identification tip: Irregularly darker depressed areas on mature fruit with hard, white pithy areas under skin.
Western boxelder bug nymphs and adult
Western boxelder bug nymphs and adult
Identification tip: The adult (right) is mostly black with a red abdomen and red line markings on the wings. Young nymphs are bright red to dark red.
Lygus bug
Lygus bug adult
Identification tip: Prominent triangle in center of the back.
Lygus damage
Lygus bug damage
Identification tip:  Depressed areas with slightly swollen center caused by midseason feeding, similar to that of stink bug. However, stink bug damage concentrated near stem end of fruit and lygus bug damage located anywhere on fruit surface.
Other insects—Top of page Other insect damage
Katydid nymph
Identification tip: Resemble grasshoppers but have long antennae. Nymphs wingless. (Banding on the antennae seen only in the first instar).
Katydids damage
Katydid damage
Identification tip:  Bite marks approximately 1/3 inch wide and 1/5 inch deep.
Pear psylla
Pear psylla eggs
Identification tip: Tiny, elongated, yellowish eggs laid on the underside of the leaf next to midrib.
Pear psylla damage
Pear psylla damage
Identification tip: Leaves yellow and portions of the leaf blacken from feeding and injection of a toxin.
Pear psylla nymphs
Pear psylla nymph
Identification tip: First and second instar nymphs yellow with red eyes; bodies encased in honeydew. (Third instar yellowish green and fourth instar greenish brown—neither depicted).
Pear psylla damage
Pear psylla damage
Identification tip: Black sooty mold grows on honeydew, resulting in fruit skin russet.
Pear sawfly
Pear slug (pear sawfly) larvae
Identification tip: Slimy, olive green coating over slug-shaped body; foliage skeletonized with all tissue removed except fine network of veins.
Obscure mealybug adult
Mealybug (grape, obscure) nymph
Identification tip: Closely resemble one another. Mature females about 1/5 inch long with dark purple-gray, somewhat flattened bodies; uniformly covered with a white powdery wax.
Mealybugs damage
Mealybug (grape, obscure) damage
Identification tip: Feed in the calyx end of maturing fruit and secrete honeydew that can cause skin russeting; black sooty fungus may grow on honeydew.

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