Tim Martinson and Wayne Wilcox, Department of Horticulture and Department of Plant Pathology and Plant Microbe Biology, Cornell University

Tim Martinson and Wayne Wilcox, Department of Horticulture and Department of Plant Pathology and Plant Microbe Biology, Cornell University
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Stephen Vasquez, University of California, and Matthew Fidelibus, University of California
Grapevine measles, also called esca, black measles or Spanish measles, has long plagued grape growers with its cryptic expression of symptoms and, …
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Stephen Jordan, University of Wisconsin-Madison
Effects of ringspot virus. From L to R, graft union necrosis, aerial rooting, and in the vineyard. Photos by Bob Martin, USDA-ARS.
Grapevines affected by Ringspot Virus Decline …
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Stephen Jordan, University of Wisconsin-Madison
Symptoms differ depending on the variety of affected grape and are best observed in late summer and fall. …
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Stephen Jordan, University of Wisconsin-Madison
Rugose wood is a complex disease characterized by modifications of the woody cylinder. Four different disorders make up the rugose wood complex: rupestris stem pitting, corky bark, Kober stem …
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Damon Smith, Oklahoma State University
Ripe fruit with sour rot will become soft and watery. Fruit of white cultivars will turn tan …
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Damon Smith, Oklahoma State University
Figures 1 and 2. Crown gall symptoms on a one-year-old grape vine (L) and a somewhat fleshy gall symptom
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Stephen Jordan, University of Wisconsin-Madison
Symptoms of peach rosette mosaic virus appear 3 to 4 years after infection. The plant canopy is umbrella-like with shortened and crooked internodes. Leaves are misshapen with a …