University of Georgia

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UGA Extension Viticulture Blog

September 2022

  • Additional Pierce’s Disease Information (Crimson Cabernet and Other Observations)

    Phil Brannen

    Just as an update from my last blog post, we are now finding Pierce’s disease (PD) symptomatic Crimson Cabernet vines in our Horticulture Farm trial in Watkinsville, GA — just outside of Athens. Shane Breeden, a Ph.D. student in the Plant Pathology Department identified symptoms last week, and Kendall Johnson, another Ph.D. student from the […]

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  • End-of-Season Pierce’s Disease Observations

    Phil Brannen

    We continue to see quite a bit of Pierce’s disease (PD) in our vineyards this year, to include our northern Georgia sites. I am convinced that bacterial titer drives this disease, and bacterial levels in the plant are determined by the vectors (type and number of sharpshooters involved), winter temperatures, and possible alternative hosts. I […]

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