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Hover flies
The adult is a fly that mimics the coloration of wasps; it often hovers during flight. It is found among aphid colonies, often co-existing with other predators such as the gall midge.
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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.
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Green stink bug
Stink bug adults have a broad, flattened, shield-shaped body and a narrow head. The green stink bug is uniformly grass-green.
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Green fruitworm
Immature larvae of the green fruitworm (GFW) feed on flower buds and new foliage.
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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.
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Green June beetle
The adult is velvet green dorsally with yellow-orange margins on the elytra. Ventrally it is a shiny metallic green mixed with orangish yellow. The larva is a large, C-shaped grub that lives in the soil and is not found in the trees.
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Fall webworm
Adult is a white moth with dark spots on the wings, which may be less distinct in northern specimens. The pale yellow larva has a dark head and dark tubercles with clumps of hairs.
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Apple pith moth
Head of adult is covered with white scales; forewings are narrow, mostly black or dark brown with white marks and usually with an irregular faint, rusty yellow line in the middle, and with two prominent black scale tufts.
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Climbing cutworms
Adults are dark brown or grayish colored moths. Larvae tend to be smooth caterpillars with few hairs, brown or black head capsules, and bodies a dull gray-brown background color with stripes, spots, or dark brown, black, yellow or white splotches.
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Powdery mildew of apple and pear
The fungus overwinters in leaf buds and sometimes flower buds. Mycelium develops rapidly on unfolding leaves and appears as white, felt-like patches or as a solid mat on the upper or undersurface of the leaf.
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Lesser peachtree borer
Adult is a clear-winged, metallic-blue moth that has two or more yellow bands across the abdomen, giving it a wasp-like appearance.
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Apple latent viruses
Latent viruses are viruses that survive in their host without causing symptoms. These viruses are transmitted when a virus-infected scion is grafted onto a susceptible rootstock.
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Southern blight
Trees attacked by the fungus show a general decline. In the early phase of disease, a dense mat or web of white mycelium is evident at the base of the tree.
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Shothole borer
The adult is stocky with a hard black body and antennae, leg segments and tips of elytra reddish brown; its head is not visible from above.
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Eyespotted bud moth
Adult forewings are bluish gray with a central cream-colored band and black spots. The chocolate brown larva has a black head and thoracic shield.
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Skeletonizers
The adults of the skeletonizers are brown and short, with transverse bands on each forewing. The larvae are yellow to pale green with numerous hairy discs on each segment of the body.
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Perennial canker of apple and pear
Branch lesions are elliptical, sunken, and orange, purple, or brown in color. A raised layer of callus tissue forms around the infected tissue to isolate the diseased tissue.
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Cherry fruitworm
The adult is a small, brownish gray moth with a median gray band on the forewings and a dark spot at the base of the hind wings. Although whitish gray with a black head when young, the larva eventually becomes pink tinted, with a brownish tan head.
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Spring cankerworm
The adult male is gray and has winding lines on its forewings the female has stumpy gray wings. The larva is pale green to dark brown with two yellow longitudinal bands on the sides. It moves in a looping inchworm fashion.
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Leaf weevils
Leaf weevils are green or brown curculios with a metallic appearance. Their antennae are borne on the snout.