Phil Brannen
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As we are at bud break, keep in mind the need to start sprays of mancozeb and sulfur as soon as green stem tissue shows to protect against Phomopsis and powdery/downy mildews. All require control on young tissues, but especially Phomopsis. A little bit of Phomopsis, downy mildew, or powdery mildew is never good, as…
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Hello to all. Captan is currently under review by EPA. For those of you with interest in this fungicide and its continued use for grapes, please respond with comments to EPA via the link below. Also, forward to other producers and other researchers outside Georgia and the Southeast who should respond to the need for…
Posted in: Uncategorized -
As the grape season wrapped up in 2018, county agents from Habersham, Lumpkin, Rabun, Towns and White Counties were busy collecting powdery mildew samples for a new multi-state USDA-SCRI grant, the “Fungicide Resistance Assessment, Mitigation and Extension Network for Wine, Table and Raisin Grapes,” also known as FRAME. This grant will study powdery mildew resistance…
Posted in: Bunch Grapes -
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 materials have been compared, and…
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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 and symptomatic, the vines need…
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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 this time — all free.…
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I was at a muscadine meeting in Americus, GA earlier this week (Thursday), and I made comment on how I have never really observed significant crown gall on muscadine grapes in Georgia. I scheduled a muscadine grape visit with a producer near Ellijay, GA the next day, and I can now say that I have…
Posted in: Muscadine Grapes -
We have been receiving multiple grape samples with black rot in our diagnostic clinic. Only one or two infected grapes can provide a vast number of spores for secondary infections of clusters going forward. Prevalent rainfall has made control difficult. The disease cycle will slow as grapes mature, but fruit can still be infected till…
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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 Campbell (UGA grad student) reported…
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Sarah Campbell, a graduate student in the Plant Pathology Department at the University of Georgia, has been reviewing our situation with downy mildew resistance to three fungicide classes utilized in Georgia. The maps in the document below show the counties which she has surveyed and whether resistance has been found in those counties. Of critical…
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