Fruit Pest and Beneficial Search

Use this search to identify diseases, insect and mite pests and beneficials, a critical step in any integrated pest management (IPM) plan. This search covers tree fruit and grape pests and is based on the publications “Tree Fruit Field Guide to Insect, Mite, and Disease Pests and Natural Enemies of Eastern North America” and “A Pocket Guide for Grape IPM Scouting in the North Central and Eastern United States.”


  • Alternaria blotch

    Disease

    The disease primarily affects the foliage, causing circular, necrotic lesions with a light brown interior that later become surrounded by a darker purplish halo.

  • Alternaria fruit rot

    Disease

    The disease appears as velvety dark green to black, circular, sunken lesions on mature fruit; the infected tissue is firm and brown. Disease is typically associated with over-ripe or damaged fruit, or fruit held in storage.

  • American hawthorn rust

    Disease

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

  • American plum borer

    Insect

    The adult is a light grayish brown moth with reddish brown forewings marked by wavy black and brown vertical bands about two-thirds the distance from the base.

  • Angular leaf scorch

    Disease

    Lesions are initially yellow or reddish and confined by major veins. They later become necrotic and surrounded by yellow or red margins. Late-season infections may look like freckled spots and can cause premature defoliation. Infected flower clusters dry up. Unlike Botrytis blight, this disease infects only the berry stems, not the rachis. The pathogen overwinters in fallen infected leaves. The disease may seem absent in most years but can be severe in years with prolonged rainy weather.

  • Anthracnose

    Disease

    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.

  • Ants

    Insect

    A column of ants on a vine during the summer may be tending mealybugs because ants feed on the secreted honeydew.

  • Apple (Lyonetia) leafminer

    Insect

    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.

  • Apple anthracnose

    Disease

    Branch lesions first appear as small, circular spots that are purple or red when wet. As lesions enlarge, they become elliptical, sunken and turn orange to brown. A distinct margin develops between healthy and diseased tissue, which eventually causes the bark to crack around the infected area.

  • Apple latent viruses

    Disease

    Latent viruses are viruses that survive in their host without causing symptoms. These viruses are transmitted when a virus-infected scion is grafted onto a susceptible rootstock.

  • Apple leaf (curling) midge

    Insect

    The adult is a tiny dark brown fly, and the larva is a yellow-white maggot with a reddish tinge.

  • Apple maggot

    Insect

    Adults are black flies with three or four white cross bands on the abdomen, a prominent white spot at the posterior end of the thorax, and the wings are marked with black bands in the shape of an "F".

  • Apple mosaic virus

    Disease

    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.

  • Apple pith moth

    Insect

    Head of adult is covered with white scales; forewings are narrow, mostly black or dark brown with white marks and usually with an irregular faint, rusty yellow line in the middle, and with two prominent black scale tufts.

  • Apple red bug

    Insect

    Adult has head and thorax bright red in color with brown wings.

  • Apple rust mite

    Insect

    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.

  • Apple scab

    Disease

    On leaves, young lesions are velvety brown to olive green with indistinct margins, and will often not be readily noticeable until after petal fall in commercial orchards.

  • Apple seed chalcid

    Insect

    Adult is a small, dark wasp with a bright green head, thorax and abdomen with coppery or bronze metallic reflections, brownish yellow legs, clear hyaline wings, and a long ovipositor.

  • Apple sucker

    Insect

    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.

  • Apple union necrosis and decline

    Disease

    AUND is due to an incompatibility at the graft union where a resistant scion is grafted onto a susceptible, but tolerant rootstock, most commonly MM.106.

Michigan State University Michigan State University Close Menu button Menu and Search button Open Close