College of Agriculture & Natural Resources

• Pear rust mite

  The overwintering stage is a light brown, wedge-shaped adult, which cannot be seen without a 15X hand lens. The summer forms are nearly white in color, and even smaller than the overwintered adults.

• Plum rust mite (Peach silver mite*)

  Adult is minute and wormlike, with two pairs of legs, and pale yellow to brownish yellow in color. The nymph is pale yellowish white and closely resembles the adult.

• Twospotted spider mite

  Adult and nymphal mites are yellowish to pale green with a dorsal pair of apparent dark "spots". Males are smaller than females and have a pointed abdomen. The female takes on an orange tinge in the fall.

• Tufted apple bud moth

  Adult is an inconspicuous moth, varying from mottled gray at the wing base to brown at the wing tip, with a lighter colored margin along the wing's leading edge. Two or three groups of tufted scales can be seen on the top of the wings.

• Pearleaf blister mite

  The adults are very small and cannot be seen without a 15X hand lens; the body is white and elongate oval in shape, like a tiny sausage.

• Peachtree borer

  Adult is a clear-winged, metallic-blue moth that has one broad orange or two or more yellow bands across the abdomen; both sexes have more amber sheen on wings than lesser peachtree borer adults.

• Forest tent caterpillar

  Adults are reddish brown with two brown, transverse-parallel bands. Masses of shiny black eggs are laid in a ring around twigs. Larvae have long silky hairs on their body and a row of elongated spots along the back.

• Replant disorders

  In general, trees suffering from replant disease show slow and uneven growth within the first three years of planting. Both specific and non-specific replant disorders are known.

• Root-lesion nematode

  Root-lesion nematodes are microscopic, migratory endoparasites that feed on the root systems of many crops. Affected trees appear stunted, may exhibit chlorosis or yellowing of the leaves, and have poor yields; young trees may be killed.

• Japanese beetle

  Japanese beetles can be present from June through September. Japanese beetle adults are metallic green or greenish bronze with reddish wing covers and several white spots near the abdomen tip and along the sides. Larvae are larger C-shaped grubs that live in the soil.

• Dusky stink bug

  Stink bug adults have a broad, flattened, shield-shaped body and a narrow head. The dusky stink bug is dark brown, with sharp shoulder projections.

• Green peach aphid

  These smooth-looking, pear-shaped insects have long antennae and a pair of cornicles extending from the posterior end of the body.

• Green ring mottle virus

  The virus produces symptoms on sour cherry, primarily the variety Montmorency. Apricot, peach, and sweet cherry are symptomless hosts. Yellow mottling with irregularly shaped green islands or rings appear on the leaves of infected trees.

• Roundheaded appletree borer

  Adult has a hard, elongated body, with white and brown longitudinal stripes and long antennae. The larva is a fleshy, cream-colored legless grub with a dark brown head, blackish mandibles.

• Assassin bugs

  The head is narrow and elongate with the portion behind the eyes neck-like. Sometimes a sculptured crest may be found on the pronotum. The front legs are specialized for hunting.

• Apple maggot

  Adults are black flies with three or four white cross bands on the abdomen, a prominent white spot at the posterior end of the thorax, and the wings are marked with black bands in the shape of an "F".

• Redbanded leafroller

  The adult's forewings are grayish brown with a subtle dark red and brown oblique band. The larva is pale green with a yellow or green head.

• Black cherry aphid

  Adults and nymphs are shiny black soft-bodied insects; adults may or may not have wings. Nymphs are smaller, but generally similar in appearance to the adults.

• Silver leaf

  Silvering of the foliage is the characteristic symptom. At first, silvering may be associated with only one or two major branches, but eventually the entire tree becomes silvery in appearance. When infection is severe the leaves may curl upward.

• Crown gall

  Infected trees are often stunted and produce small, chlorotic leaves. Spherical to elongated swellings along the roots or on the trunk just above the soil line is the primary symptom.