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Apple rust mite
The vermiform adult has two pairs of legs at the front of its body. Brownish yellow in color, they are invisible to the naked eye, requiring a minimum magnification of 15X to be observed.
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Minute pirate bug
Adults are very similar in size to the mullein plant bug (Campylomma varbasci), but their head is narrower and their wings are colored contrasting white and black.
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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.
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European earwig
The European earwig is dark brown with an elongated body, equipped with pincer-like forceps at the rear of the abdomen. The short elytra do not entirely cover the abdomen.
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Snowy tree cricket
Adult somewhat resembles a field cricket, but is pale green in color and has a longer, more slender body and smaller head. Antennae are much longer than the body; males have stiff veins in their flat wings.
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Periodical cicada
Adults are wedge-shaped, nearly black, with red eyes and red-orange wing veins. The clear wings are held tent-like over the body.
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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.
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Apple (Lyonetia) leafminer
The adult has narrow white forewings with extensive gray-black and brown markings apically wing margins are fringed with long hairs. The larva is whitish and generally concealed within the leaf mine.
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Prionus borers
Adults are robust, broad, somewhat flattened blackish to reddish brown beetles with antennae roughly half the length of their bodies.
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Sparganothis fruitworm
Adult is a vivid yellow moth with grayish magenta V-shaped marks on the forewings and reddish orange lace-like markings. Larvae are pale green with yellowish-green head.
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Winter moth
Adult male has grayish-brown wings; the female has remnants of wings and so cannot fly. This, in combination with the female's large body, makes the legs appear to be long, and gives her the superficial appearance of a spider.
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Variegated leafroller
Adult is grayish magenta with dark brown bands on the middle and end of the forewing. Larvae are pale green with yellowish green heads.
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European apple sawfly
The adult looks similar to a small, orange-brown wasp with the ventral side and legs orange in color. It has transparent wings with many veins. The egg, oval and translucent, is inserted into the receptacle of the flower.
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Flatheaded appletree borer
The adult is a short-horned beetle, flattened above, with short antennae and large conspicuous eyes. The upper surface of the body is dark metallic brown with slightly patterned wing covers.
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Phony peach disease
The canopy of infected trees is flattened and compacted due to shortening of the internodes; the foliage tends to be a darker green. Infected trees may also flower and set fruit earlier, bear smaller fruit, and may suffer a substantial reduction in yield.
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Obliquebanded leafroller
Adult wings are beige, tinged with red. Forewings are crossed with oblique brown bands. The female is larger than the male. The green eggs are laid in masses on the upper surface of leaves.
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Anthracnose
Lesions start as small, circular, tan to brown spots on mature or nearly mature fruit. Lesions expand rapidly, with a tendency to form concentric rings that may or may not be sunken.
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Pale apple leafroller
The adult is elongated and dull gray. The larva is creamy white with an amber head, which turns black in the penultimate instar.
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Oriental fruit moth
The adult is a small moth with dark gray mottled wings that lighten somewhat at the outer edges. The larva is dirty white to pinkish with a reddish brown head and an anal comb.
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Pistol casebearer
Adult is dark gray with fringed wings. The pistol casebearer appears similar to a cigar casebearer: a small, yellowish larva with a black head that builds and hides in a shelter.