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Tag: disease management

Posted on June 20, 2019June 20, 2019

Powdery mildew: How important is overwintering inoculum?

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

Mature (dark) and immature cleistothecia on a leaf. The number of mature cleistothecia present at the end of one growing season
…
Posted on June 20, 2019June 20, 2019

Armillaria Root Rot in Grapes

Symptoms       Cause       Management       More Info

Jay W. Pscheidt, Oregon State University

Symptoms 

Mildly symptomatic grapevines have shorter canes than healthy grapevines. Severe symptoms not only include shorter canes, but also include dwarfed and chlorotic leaves.

Diagnostic mycelial fans can be …

Posted on June 20, 2019June 20, 2019

Grapevine Measles

Symptoms       Causal Organisms       Management       More Information

Stephen Vasquez, University of California, and Matthew Fidelibus, University of California

Symptoms

Grapevine measles, also called esca, black measles or Spanish measles, has long plagued grape growers with its cryptic expression of symptoms and, …

Posted on June 20, 2019June 20, 2019

Ringspot Virus Decline

Symptoms       Management Options       Causes       More information

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.

 

Graft union necrosis caused by ringspot virus. Aerial rooting caused by ringspot virus. Ringspot virus in the vineyard.

 

Symptoms

Grapevines affected by Ringspot Virus Decline …

Posted on June 20, 2019June 20, 2019

Grape Leafroll Disease

Symptoms       Management Options       Causes       More info

Stephen Jordan, University of Wisconsin-Madison

Symptoms

Grape leafroll disease. Photo by Ed Hellman, Texas AgriLife Extension.

Symptoms differ depending on the variety of affected grape and are best observed in late summer and fall. …

Posted on June 20, 2019June 20, 2019

Rugose Wood Complex of Grapevines

Causes       Symptoms       Management Options       More Info

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 …

Posted on June 20, 2019June 20, 2019

Sour Rot of Grapes

Symptoms       Management Options       Causes       More Info

Damon Smith, Oklahoma State University

Symptoms

Symptoms of sour rot. Photo by Eric Stafne, Mississippi State University.

Ripe fruit with sour rot will become soft and watery. Fruit of white cultivars will turn tan …

Posted on June 20, 2019June 20, 2019

Crown Gall of Grapes

Copyright 2006 Melodie Putnam, Oregon State University Plant Clinic

Symptoms       Causes       Management Options       More Info

Damon Smith, Oklahoma State University

Symptoms

Figures 1 and 2. Crown gall symptoms on a one-year-old grape vine (L) and a somewhat fleshy gall symptom

…
Posted on June 20, 2019June 20, 2019

Ripe Rot of Grapes

Symptoms       Management       Causes       More Info

Damon Smith, Oklahoma State University

Symptoms

Berry rot and collapse as a result of ripe rot. Note the pink color of the fungal growth and spores on the surface of several of the berries. Photo
…
Posted on June 20, 2019June 20, 2019

Peach Rosette Mosaic Virus

Symptoms       Management Options       Causes       More information

Stephen Jordan, University of Wisconsin-Madison

Symptoms

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 …

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This is a national Cooperative Extension resource

This work is supported in part by New Technologies for Agriculture Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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