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Tag: grapes abiotic problems

Posted on June 20, 2019June 20, 2019

Nematodes

Dagger Nematodes       Root Knot Nematodes       Citrus Nematodes       Lesion Nematodes       Ring Nematodes       Stubby Root Nematodes       Management       More info

Stephen Jordan, University of Wisconsin-Madison

What are nematodes?

Nematodes are wormlike non-segmented invertebrate animals found in marine, freshwater, and terrestrial habitats. Plant-parasitic nematodes …

Posted on June 20, 2019June 20, 2019

Young Grapevine Decline

Symptoms       Cause       Management       More Info

Jay W. Pscheidt, Oregon State University

Symptoms 

Young vine decline develops slowly in the first few seasons of vineyard establishment and production. Young vines generally appear normal at planting, but differences in vigor become marked: …

Posted on June 20, 2019June 20, 2019

Grapevine Bleeding

Overview       Science of Bleeding       Management       More Information

Eric Stafne, Mississippi State University

What is Grapevine Bleeding?

Removal of water from the soil by epidermal cells of roots and movement into xylem under pressure will produce a phenomenon known as “bleeding”. …

Posted on June 20, 2019June 20, 2019

Estimating Grapevine Potential Productivity after Spring Frost or Winter Bud Damage

Estimating Potential Crop Load       2012 Update       More information

G. Stanley Howell, VESTA Viticulture Coordinator, Professor and Viticulturist Emeritus, Michigan State University

This information is based on known relative productivity of Concord and Niagara primary and secondary buds and was written …

Posted on June 20, 2019June 20, 2019

Cold Injury in Grapevines

Assessing Injury       Management       Cold Hardiness Monitoring Programs       More Info

Mark Chien, Penn State University and Michelle Moyer, Washington State University

There are many limiting factors to grape production, but one of the most challenging is that of winter cold damage. …

Posted on June 20, 2019June 20, 2019

Ozone Damage of Grapevines

Symptoms       Causes       More information

Fritz Westover, Texas AgriLife Extension

Interveinal stipple on upper leaf side of a mature Lomanto grape leaf. Leaf underside of Lomanto grape shows necrotic spots, but not stipple. Photos by Fritz Westover, Texas AgriLife Extension.

 

image:Ozone1.jpg image:Ozone3.jpg


 

Symptoms

…
Posted on June 20, 2019June 20, 2019

Causes of Poor Fruit Set in Grapes

What is poor fruit set?       Causes       Documenting poor fruit set       More Info

Patty Skinkis, Oregon State University

Introduction

An individual grape inflorescence (flower cluster) contains hundreds of flowers. However, not all of those flowers will set fruit and develop into …

Posted on June 20, 2019June 20, 2019

Bunch Stem Necrosis

Symptoms       Causes       More information

Stephen Jordan, University of Wisconsin-Madison

Symptoms

Bunch stem necrosis. Photo by Lorraine Berkett, University of Vermont.

Bunch stem necrosis (BSN), also known as “waterberry,” can occur around bloom (when it is called early bunch stem necrosis), …

Posted on June 20, 2019June 20, 2019

Frost Injury, Frost Avoidance, and Frost Protection in the Vineyard

 

Effects of Frost       Reducing the Risk       Pruning Effects       Modifying Temperatures       More Info

Ed Hellman, Texas AgriLife Extension

This article answers the following questions:

  • How can you protect your grapes from frost damage?
  • How much damage can frost cause in grapes?
…
Posted on June 20, 2019June 20, 2019

Blackleaf in Grapes

Symptoms       Causes       Effects       Prevention       More information

Introduction

Mercy Olmstead, University of Florida and Joan Davenport, Washington State University

Figure 1. Blackleaf symptoms in ‘Concord’ grapevines. Photo by Mercy Olmstead, University of Florida.


Once thought to be due to potassium deficiency, …

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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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