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Fruit & Nuts

Field Crops


Showing results for content tagged 'grapes'. Search instead for the keyword 'grapes'.

  • Grapes

    Resources for growing healthy wine and juice grapes in Michigan. Sign up for our e-newsletter for updates about integrated pest management, viticulture, research and events. Browse our web for videos, publications and more.

  • Integrated Pest Management Academy

    The Desire to Learn Integrated Pest Management (IPM) Academy is an interactive, online program designed to provide a comprehensive and convenient online learning experience. Current topics include an introduction to IPM, plant science, soils 101, natural enemies, conserving pollinators, Enviroweather and scouting.

  • Fanleaf degeneration

    Fanleaf degeneration affects vinifera cultivars. It is characterized by fan-shaped leaves with toothed margins, proliferation of shoots, short internodes and zigzag growth. Foliar symptoms appear early in spring and persist through the growing season. Sometimes leaves show a bright yellow mosaic or yellow vein banding with little or no malformation. Fruit clusters are small with poor fruit set, irregular ripening and shot berries. The causal virus is spread by dagger nematodes and planting material. The virus is not transmitted through seeds and has no natural weed hosts. Roots from infected vines can be a source of infection even after the mother plant has been removed.

  • Pierce’s disease

    Initially, only a few shoots start to show symptoms in mid- to late summer. Leaves show scorching from the margin inwards and drop off, leaving the petiole attached to the shoot. Flower clusters may set berries, but these tend to dry up. In fall, infected shoots mature in a patchy manner, leaving “islands” of green tissue surrounded by dark brown mature wood. In spring, bud break on infected vines may be delayed as much as 2 weeks, and new shoots are stunted. An infected vine may die the first year after infection or may live for 5 or more years, depending on the cultivar, the vine’s age and climatic conditions. Pierce’s disease is caused by a bacterium that lives in the xylem and is vectored by sharpshooter leafhoppers and spittlebugs. The bacterium is present in native plants such as grasses, sedges, bushes and trees. The range of insect vectors determines the range of the disease.

  • Tachinid fly

    Tachinid fly adults are hairy and bristly. Their larvae feed on the larvae of some pests.

  • Banded grape bug

    The banded grape bug has piercing-sucking mouthparts that it inserts into plant tissue to suck out plant sap. It completes one generation per year on grapes and is active in vineyards from shortly after bud break to early July.

  • Pear slug (Pear sawfly)

    The adult looks similar to a small, black-bodied wasp with the ventral side and legs yellow in color. The larva is small, fleshy, dark green to orange, slug-like, and slime-covered, with the front part of the body enlarged.

  • 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.

  • 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.

  • Grape flea beetle

    The grape flea beetle (or steely beetle) is a shiny, metallic dark blue. It may jump when disturbed. Larvae are yellow-brown with a dark head and feed on clusters and leaf surfaces.

  • Grape erineum mite

    This very small mite cannot be seen without magnification. It overwinters under the bark of 1-year-old canes.

  • Shield bugs

    Many shield bugs, pentatomids, are predatory and can attack beetles and caterpillars.

  • 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.

  • 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.

  • Gallmakers on leaves

    Many galls of various shapes occur on grapevines as a result of attack by small flies (gall midges). Galls can occur on leaves, tendrils and blossom buds. Numerous species of gall midges attack grape.

  • Ichneumonids

    Ichneumonids are small black, orange or yellow wasps that prey on larvae of grape berry moth and other insects. Adults are less than 10 mm long, and many species are found in vineyards and surrounding woods.

  • 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.

  • Flavescence dorée

    Flavescence dorée affects only vinifera grapes and interspecific hybrids. Labrusca cultivars are resistant. Symptoms usually appear the year after infection and either get progressively worse until the vine dies or disappear in an apparent recovery. Symptoms include delayed or no bud break and progressively shortened internodes. In summer, vines take on a weeping posture, and shoots become rubbery and fail to lignify. Characteristic black pustules may be seen in longitudinal rows near the bases of shoots. The leaves have golden yellow or reddish patches and curl downward. Growing points become necrotic, and flower and fruit clusters shrivel up and fall. The pathogen overwinters in infected canes and is spread by a leafhopper. Symptoms may resemble those of certain virus diseases or potato leafhopper damage.

  • 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.

  • Yellowjackets

    Yellowjackets and other wasps may break open grape berry skins during late summer. Early in the growing season, wasps are mainly predatory, but late in the season they begin to search for sugar, including ripened fruit.

  • Prionus borers

    Adults are robust, broad, somewhat flattened blackish to reddish brown beetles with antennae roughly half the length of their bodies.