College of Agriculture & Natural Resources

• Pear rust mite

  The overwintering stage is a light brown, wedge-shaped adult, which cannot be seen without a 15X hand lens. The summer forms are nearly white in color, and even smaller than the overwintered adults.

• Plum rust mite (Peach silver mite*)

  Adult is minute and wormlike, with two pairs of legs, and pale yellow to brownish yellow in color. The nymph is pale yellowish white and closely resembles the adult.

• 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.

• Lesser appleworm

  The adult is a small gray moth with distinct small orange bands or patches on the wings; some blue is also evident in newly emerged specimens.

• Spirea aphid

  The eggs are oval and shiny black. The adults and nymphs are olive-green with brown-black legs, antennae, and cornicles. They live in colonies.

• 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.

• 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.

• 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.

• X-Disease

  This disease is caused by a mycoplasma and infects many varieties of stone fruits. On cherry, infected trees tend to develop a dieback and a generally unthrifty appearance. Infected trees decline, but the rate of decline is dependent on the rootstock.

• Bacterial spot

  Bacterial spot appears on apricot, peach, nectarine, plum and prune.

• 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.

• 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.

• 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.

• Prunus stem pitting

  Affected trees appear weak and show a general decline. Leaves may have upward cupping, turning prematurely yellow or reddish purple, droop, and then prematurely drop. The bark is abnormally thick and spongy and the wood underneath has a severely pitted, indented texture. Symptoms are most severe in the wood just above and below the soil line.

• 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.

• Forbes scale

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

• 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.

• 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.

• Plum pox virus

  There is considerable variation in symptoms, depending on which species of stone fruit is affected, variety, age, and general nutritional status of the tree. On leaves, symptoms may include vein yellowing, banding, or the formation of light green to yellow rings.

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  Pesticide Applicator Training

  This course is designed for those who are studying to take the Michigan Department of Agriculture and Rural Development (MDARD) Restricted Use Pesticide (RUP)Exam or for those who need a refresher on safe pesticide handling. The course material follows the National Pesticide Core Manual. Those who complete the course can receive 12 RUP credits.