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Grape > Leaves > Malformed or distorted leaves

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Credit: Michelle Grabowski, U of MN
Credit: Michelle Grabowski, U of MN
Credit: Michelle Grabowski, U of MN
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Herbicide Injury

Distorted and twisted leaves, margins of the leaf are often cupped upward
Stunted or unusual growth of vines

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Credit: E. C. Burkness, U of MN
Credit: E. C. Burkness, U of MN
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Grape Phylloxera

Galls are formed on the undersides of leaves from phylloxera feeding
Leaves become cupped upward
Present throughout the growing season
More information on Grape Phylloxera...

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Credit: M. Ellis, OSU
Credit: M. Ellis, OSU
Credit: M. Ellis, OSU
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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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Credit: Department of Plant Pathology Arch
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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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Credit: William M. Brown Jr., Bugwood.org
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Fanleaf Degeneration
Grapevine Fanleaf Virus

Leaves are fan-shaped (resembling 2,4-d injury)
Leaves may develop a bright yellow mosaic pattern or yellow vein banding
More information on Fanleaf Degeneration...

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