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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Fruit > Grape > Fruit rotten or shriveled

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Grape > Fruit > Fruit rotten or shriveled

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  • Image: Anthracnose 1
  • Image: Anthracnose 2
  • Image: Anthracnose 3

Anthracnose (Bird’s Eye Rot)
Elsinoe ampelina

  • Berries develop small, reddish circular spots that average 1/4 inch in diameter that may become sunken with a dark brown to black margin, resembling a “bird’s eye”
  • Berries are susceptible from bloom to veraison
  • Infected shoots develop spots that become sunken lesions with gray centers and dark reddish-brown raised edges
  • Infected shoots may be confused with hail damage; but unlike hail damage, the edges of the lesions are raised and black
  • Leaves develop circular lesions with gray centers and brown or black margins, the center of the leaf spot may fall out resulting in small ragged holes in the leaf
  • Infection is more prevalent in rainy years
  • More information on Anthracnose (Bird’s Eye Rot)...
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  • Image: Grape Berry Moth 1
  • Image: Grape Berry Moth 2
  • Image: Grape Berry Moth 3

Grape Berry Moth

  • Larva feeding results in the fruit having a hole that appears “ripped”, with the berry eventually drying out
  • Dark tunnels may be apparent from larvae feeding just below the skin
  • Larvae present from June through August
  • Larvae feed on stems, blossom buds, and berries
  • Late instars are green to purple in color, and are 1/3 inch in length when fully grown
  • More information on Grape Berry Moth...
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  • Image: Black Rot 3
  • Image: Black Rot 1
  • Image: Black Rot 2

Black Rot
Guignardia bidwellii

  • Berries that have been infected for several days dry up, shrink and wrinkle into a bluish black ‘mummy’ that remains attached to the cluster
  • A red ring appears on berries, this grows quickly until the entire berry is brown
  • Multiple berries in a cluster can be infected
  • Symptoms on berries commonly show up when the fruit is half grown
  • Leaves have round tan spots with dark edges, tiny black pimples are often visible in the center of the spot
  • Black slightly sunken ovals or short streaks can be seen on Infected young green vines, leaf and flower stalks
  • More information on Black Rot...
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  • Spotted Winged Drosophila 1
  • Spotted Winged Drosophila 2
  • Spotted Winged Drosophila 3

Spotted Winged Drosophila
Drosophila suzukii

  • Active in gardens from July to September
  • Larvae feed on healthy, intact, ripening fruits
  • Fruit becomes soft and decays
  • Adult flies are small (1/8 - 1/12 inch) long, yellowish-brown and red eyes, larvae are small (1/8” long), white and cylindrical
  • More information on Spotted Winged Drosophila
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  • Image: Phomopsis 2
  • Image: Phomopsis 1
  • Image: Phomopsis 3

Phomopsis Cane and Leaf Spot
Phomopsis viticola

  • Fruit will turn light brown and shrivel, small raised black pimple like structures may be visible on the fruit surface
  • Symptoms on berries are most obvious close to harvest on maturing fruit
  • Leaves may be puckered along the veins or the margins may be turned under
  • Dark brown spots with yellow edges can also appear along leaf veins and petioles, the lower leaves are most commonly affected
  • More information on Phomopsis Cane and Leaf Spot...

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