College of Agriculture & Natural Resources

• 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.

• 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.

• 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.

• Oystershell scale

  The adult female remains immobile under a small brown scale in the shape of an oyster shell attached to the bark of branches. The white and oval eggs are laid inside the scale and crawlers emerge in the spring during the petal fall stage of apple.

• Codling moth

  The adult's forewings are striped with fine brown-gray lines and a distinctive bronze to brown-black oval spot at the tip. Eggs are laid on the leaves or fruit.

• European corn borer

  Adult is a pale yellowish brown moth with irregular darker bands running in wavy lines across wings male is distinctly darker than the female.

• 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.

• 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.

• 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.

• 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.

• Spiders: Foliage Hunters

  The body of a spider is divided into two regions, the cephalothorax and abdomen. The cephalothorax bears the eyes (various numbers and arrangements), mouthparts, pedipalps and legs (four pairs), and the unsegmented abdomen bears the genital structures, spiracles, anus and spinnerets (silk-spinning structures).

• Leaf weevils

  Leaf weevils are green or brown curculios with a metallic appearance. Their antennae are borne on the snout.

• Spotted tentiform leafminer

  The adult is a tiny beige moth with heavily fringed wings striped with golden brown and white bands. Eggs are laid individually on the undersurface of the leaves.

• 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.

• Forbes scale

  Round or elongate gray scale with a raised reddish area in the center, which distinguishes it from the San Jose scale.

• Brown stink bug

  Stink bug adults have a broad, flattened, shield-shaped body and a narrow head. The brown stink bug is brown to grayish-brown and slightly speckled.

• Pear psylla

  Adults resemble very small cicadas and can be reddish brown or tan to light brown. Smaller, wingless nymphs are yellow with red eyes, flat and oval in shape, and develop within a clear honeydew drop.

• Moldy core and core rot

  Moldy core is associated with several different fungi. Infection is initiated at the calyx end and the fungi proceed to grow inward into the carpel tissue or locules and cause a core rot.

• 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.

• American hawthorn rust

  Attacks only the leaves of apple and pear; affects the apple varieties McIntosh and Cortland in particular.