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Blister spot
Lesions begin as small, darkened, water-soaked areas, generally around lenticels and typically on the lower half of the apple.
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Pear plant bug (Green apple bug)
The adult pear plant bug is brownish yellow with two dark bands on the thorax and the extremities of its anterior wings are yellowish in color.
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Apple sucker
Adult resembles a miniature cicada, greenish yellow to yellow in color but sometimes containing reds or browns, with eyes pale green to reddish brown, and long slender antennae; wings are transparent and iridescent.
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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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Leaf weevils
Leaf weevils are green or brown curculios with a metallic appearance. Their antennae are borne on the snout.
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Black pox of apple (blister canker of pear)
On apple, conical, smooth, shiny black swellings are evident on current season's growth. As lesions age, they become ovoid with raised borders. On leaves, lesions begin as small, circular green spots surrounded by a red halo.
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Pear thrips
Adult is slender and brown, with short antennae and a swelling behind the head; the wings are long and narrow, with fringes of long hairs.
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Forbes scale
Round or elongate gray scale with a raised reddish area in the center, which distinguishes it from the San Jose scale.
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Cherry leafminer
The adult is a small, bronzy tan-colored moth, with a wavy darkish brown to black band at the outer third of the forewings.
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Apple red bug
Adult has head and thorax bright red in color with brown wings.
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San Jose scale
Adult males are minute, winged insects about 1 mm long and golden brown with a reddish tinge. Scales may be either disk-shaped or oval, and are composed of concentric rings of gray-brown wax radiating from a tiny white knob.
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Alternaria blotch
The disease primarily affects the foliage, causing circular, necrotic lesions with a light brown interior that later become surrounded by a darker purplish halo.
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Lady beetles
Adults are oval and convex in shape, often brightly colored (e.g., orange-red or yellow) and usually with black spots or marks on their wing covers, sometimes with a checkerboard appearance.
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European red mite
Adult female European red mites are less than 0.5 mm and dark red with eight legs. Adult males are smaller than the females and have a pointed abdomen. Males are usually dull green to brown.
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Green pug
The adult is a grayish moth with mottled or scalloped dark striations toward the wing margins. The larva is a green inchworm with a dark head and a dark reddish brown dorsal mid-line present in later instars.
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Dock sawfly
The adult is bluish black with red legs. The larva is a smooth velvety green worm with white legs and a dark head.
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Apple mosaic virus
Young leaves develop pale to bright cream-colored spots, blotches, bandings or patterns as they expand in the spring. These turn brown and become necrotic as they age and premature defoliation may occur when infection is severe.
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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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Dogwood borer
The adult is bluish black with yellow bands and has clear wings, resembling a wasp. Larva is creamy white to pink with a sclerotized reddish head.
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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.