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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Fruit > Grape > Malformed or distorted leaves

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Grape > Leaves > Malformed or distorted leaves

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  • Image: Herbicide Injury 1
  • Image: Herbicide Injury 2
  • Image: Herbicide Injury 3

Herbicide Injury

  • Distorted and twisted leaves, margins of the leaf are often cupped upward
  • Stunted or unusual growth of vines
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  • Image: Grape Phylloxera 1
  • Image: Grape Phylloxera 2

Grape Phylloxera

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  • Image: Phomopsis 2
  • Image: Phomopsis 1
  • Image: Phomopsis 3

Phomopsis Cane and Leaf Spot
Phomopsis viticola

  • 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
  • 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
  • More information on Phomopsis Cane and Leaf Spot...
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  • Image: Anthracnose 2
  • Image: Anthracnose 1
  • Image: Anthracnose 3

Anthracnose (Bird’s Eye Rot)
Elsinoe ampelina

  • 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
  • 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
  • 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
  • Infection is more prevalent in rainy years
  • More information on Anthracnose (Bird’s Eye Rot)...
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  • Image: Botrtyis 3
  • Image: Botrtyis 1
  • Image: Botrtyis 2

Botrytis
Botrytis cinerea

  • Leaves have large, red-brown patches; a gray mold may or may not be observed on the leaf
  • Berries become soft and watery, and may be covered in a fuzzy white-gray mold
  • White grapes will start to turn brown while purple grapes turn reddish in color
  • Berries that have been infected for several days will shrivel and drop to the ground as hard mummies
  • Multiple berries in a cluster can be infected
  • More information on Botrytis...
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  • Image: Eutypa Dieback 1
  • Image: Eutypa Dieback 2
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Eutypa Dieback
Eutypa lata

  • Young leaves will appear smaller, cupped and chlorotic
  • Shoots are stunted (shortened internodes)
  • Shoots growing on infected canes will appear deformed and discolored
  • A canker that is flat in appearance develops on older woody vines, often around old pruning wounds
  • Symptoms usually only seen in vines >6 years old
  • More information on Eutypa Dieback...
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  • Image: Tomato Ringspot 1

Tomato/Tobacco Ringspot Virus Decline

  • Leaves exhibit a random pattern of yellows and greens or leaf yellowing in first year of infection
  • Smaller leaves, shorter internodes, and reduced yield are evident in second year
  • Growth is severely stunted in the third year
  • Fruit clusters are sparse with uneven ripening
  • More information on Tomato/Tobacco Ringspot Virus Decline...
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  • Image: Grape fanleaf Degeneration

Fanleaf Degeneration
Grapevine Fanleaf Virus

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