UGA Extension Viticulture Blog

Downy Mildew Field Failures in 2018

This article (see link) reviews the state of grape downy mildew resistance in Georgia as of the close of the 2018 season.  Field failures when using strobilurin (QoI) fungicides have been confirmed in Georgia for both research and multiple commercial vineyard sites.  Of major import, efficacy of several downy mildew…
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HURRICANE FLORENCE Update

Dear Farming Community, In the following, we have compiled some information for those of you who experienced damages to their farm due to Hurricane Florence. Our aim is it to assist affected counties and growers as good as possible in the coming weeks and months with information and direct assistance on: The…
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Important Update on the Path of Hurricane Florence

Dear Grape Community,   Hurricane Florence predicted path shifted southwards. The storm is predicted to move along I 95 towards South Carolina and then inland. The Coastal Planes will be affected in the next 24 hours by high winds and heavy rain falls. The Moutains can expect heavy rain falls…
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Pierce’s Disease Update

Pierce’s disease (PD), caused by the bacterium Xylella fastidiosa, is quite prevalent in many locations this year.  The cold winter this last year has not made up for the two previous warm winters, so the bacterium has survived and prospered over the last 2-3 years. Unfortunately, once vines are infected…
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Shoo fly, don’t bother me…SWD in wine grapes

As the brix levels in the grapes continue to rise, the attractiveness of the fruit to spotted wing drosophila (SWD) also increases. We are currently only catching a few SWD in our monitoring traps, but this is expected to drastically increase in the next few weeks. And since SWD is…
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Botrytis Resistance Testing

Some of you already tried sending Botrytis samples to Clemson for fungicide resistance testing — only to find out that the service was no longer offered. However, Dr. Guido Schnabel will be conducting studies with the PROFILE system in early September, so he is volunteering to take Botrytis samples at…
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Grape root borer – REMINDER

We are still detecting grape root borer adults in north Georgia. This means that the adults are still active, with females potentially still laying eggs. While we are getting a little late for chemical control, if you have more than 35 days before harvest, you can use Lorsban 4E* (chlorpyrifos).This is…
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Downy Mildew, Powdery Mildew, and Black Rot Warnings

We are starting to see diseases pop up on both European vinifera and hybrid grapes.  For some of these, such as anthracnose and Phomopsis, much of the initial infection occurred much earlier.  The goal now would be to prevent secondary spread — especially to developing clusters.  Relative downy mildew, Sarah…
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