Pest management Guidelines
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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. In advanced cases, the grapes…
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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 development, but it also contributes…
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As a follow up to Phil’s earlier post about managing sour rot and spotted wing drosophila (SWD), I just want to mention that grapes are now becoming attractive to SWD, so if you have had issues with SWD and/or sour rot in the past, now is the time to start considering management options. The research…
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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 to some degree in most…
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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 against downy mildew, and it…
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Please let me introduce myself. My name is Mike Mengak and I am a Professor & Wildlife Outreach Specialist in the Warnell School of Forestry & Natural Resources at the University of Georgia. Our Viticulture Extension Specialist – Dr. Cain Hickey – has invited me to join the “Viticulture Team”. I appreciate the invitation from…
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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 comments may help you in…
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With veraison upon us, I just wanted to remind everyone about the continued threat from Japanese beetles. The adult beetles feed on the soft leaf tissue between veins, which often results in a skeletonized appearance. Below are images from Petit Verdot that Cain observed recently in Virginia that have been severely fed on by Japanese…
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We collected our first grape root borer adult in one of our pheromone traps in North Georgia. This means that the adults are beginning to emerge from the soil out of their pupal stage. For the next few weeks the adults will emerge, mate, and the females will lay their eggs at the base of…
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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, a previous Ph.D. student who…