UGA Extension Viticulture Blog

Grapevine Trunk Diseases Review

Dec 21, 2017 | Written by pbrannen

If you are really interested in learning about grapevine trunk diseases, this new journal article is for you (see link). It is a highly scientific article which covers the state of the art relative this topic. We mainly have issues with Botryosphaeria-type diseases, and I include Phomopsis in this category…
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The Vineyard Advisor App

Nov 8, 2017 | Written by pbrannen

You may already be aware of this app, but I just found out about it today. The Vineyard Advisor App has been developed by Texas Tech, and it appears to largely be an IPM app. I don’t think it is that helpful in identification, so you have to largely know…
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Crown Gall Symptoms

Oct 23, 2017 | Written by pbrannen

Crown gall can sometimes be confused with either leaf roll virus or Pierce’s disease. In general, if a plant is a completely brilliant red, this is likely caused by crown gall or some trunk injury. Pierce’s disease and leaf roll viruses can also have reddened leaves or leaf margins, so…
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Pierce’s Disease Action Items

Sep 14, 2017 | Written by pbrannen

Pierce’s disease (PD) is showing up in numerous vineyards on quite a few grape varieties — V. vinifera and hybrids. Vines should be scouted in each vineyard for the three characteristic symptoms of PD: leaf scorch showing marginal chlorosis and necrosis, leafless petioles “match-sticks”, and “green islands” on the canes….
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Powdery Mildew Management Information for Next Year

Aug 24, 2017 | Written by pbrannen

This information is a out of place relative the season, but I want to share it with you while it is fresh on my mind. Despite a wet year, some producers have experienced significant powdery mildew issues this year — some on the clusters. Powdery mildew contributes to poor grape…
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Sour Rot Reported — Management Plan

Aug 7, 2017 | Written by pbrannen

Sour rot is showing up in some Georgia vineyards (see photo below), and this is really no surprise with our environment. The classic vinegar smell in the vineyard helps to identify sour rot, as other rots are somewhat similar as they initially develop. We have issues with this disease complex…
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Changes to Recommended Downy Mildew Materials

Aug 2, 2017 | Written by pbrannen

Presidio is no longer registered for grape downy mildew management. This is unfortunate, but Valent confirmed this information. Presidio will be removed from the SRSFC IPM guide. You can use existing stocks of Presidio, so no worries if you have it on hand at this time. Ranman has confirmed activity…
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Powdery Mildew Management Questions — Answers from an International Workshop on Powdery Mildew

Jul 18, 2017 | Written by pbrannen

I recently had questions at a grower meeting about several aspects of powdery mildew management. I am currently attending an international meeting on powdery mildew, so it is very helpful to have my opinions supported by true experts in the field of powdery mildew management. Relative powdery mildew, the following…
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Powdery Mildew in Dry and Wet Environments

Jul 4, 2017 | Written by pbrannen

We obviously don’t have to worry about a dry environment at this time in Georgia, but as a learning point, I will share this photo with you (expand it to see the symptoms). This shows how severe powdery mildew can be in a relatively dry environment (Lodi, CA). Stephanie Bolton,…
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Mid- to Late-season Disease Control Presentation

Jul 2, 2017 | Written by pbrannen

I had a request for a copy of the disease control PowerPoint from the mid-season wine grape workshop. Please see attached. I hope it will be of value as a review for those who were there, as well as a good resource for those who were not there. Mid- to Late-Season…
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