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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.
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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.
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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.
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European fruit lecanium (Brown apricot scale)
The adult female scale is nearly hemispherical and shiny brown, with several ridges along the back. Nymphs are light colored.
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Apple red bug
Adult has head and thorax bright red in color with brown wings.
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Mineola moth (Destructive pruneworm)
Adult is a bluish gray moth that assumes a wedge shape when at rest. It has a transverse broad white stripe bordered by a smaller reddish brown stripe in the middle of the forewings a smaller set of similar bands occur near the posterior edge.
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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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Hawthorn dark bug
The young adult is black with red wing markings, which disappear a few days after it metamorphoses into an adult.
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Mucor Rot
Infected tissue appears light brown, soft, and watery. The infection usually develops at wound sites, at the calyx end, or at the stem end of the fruit.
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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.
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Tarnished plant bug
The adult is brown and the extremities of its wings are translucent with a cream-colored scutellum on its back. The nymph is pale green; from the 3rd nymphal stage, it has five black points on the back.
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Western flower thrips and flower thrips
Western flower thrips and Flower thrips are indistinguishable without a microscope. Adults are slender and yellowish, with short antennae; the wings are long and narrow, and held over the abdomen.
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Brooks fruit spot
Appears as irregular, slightly sunken dark green lesions on immature fruit.
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Comstock mealybug
Adult females and nymphs are generally similar in appearance, having an elongate-oval shape, no wings, a many-segmented body and well-developed legs.
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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.
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Armillaria root rot
The bark at the crown and roots sloughs off easily, exposing the dense white growth of the fungus. The growth extends in a fan-like pattern underneath the bark. Black shoestring-like strands may be obvious on the surface of the bark.
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White apple leafhopper
Adults are creamy white with short antennae, translucent wings, and a long wedge-shaped body. Usually found on the underside of leaves, they jump and fly with great agility. Nymphs are yellowish, wingless and very mobile; they generally move in a back-and-forth motion.
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Rosy apple aphid
Populations arise from the overwintered stem mothers, which are wingless and purplish in color, and form into colonies of rosy-purple nymphs with dark cornicles.
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Apple leaf (curling) midge
The adult is a tiny dark brown fly, and the larva is a yellow-white maggot with a reddish tinge.