Phil Brannen
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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…
Posted in: Pest management Guidelines -
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…
Posted in: Pest management Guidelines -
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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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…
Posted in: Pest management Guidelines -
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…
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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 Wine Grape Diseases Presentation
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After the meeting on Wednesday, there was a request for more information on sour rot management through use of insecticides for control of SWD. I contacted Megan Hall, who conducted this research at Cornell. She indicated that the 2016 research continued to support the use of MustangMaxx. She states, “If a grower knows that they…
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In addition to Botrytis, there is a goodly amount of powdery mildew starting to show up (see photo from today). Based on the current levels of downy and powdery mildew observed, we have a potentially difficult season ahead – once more. Remember, you are fighting an epidemic, which is a movie yet to be made;…
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We recently had a Norton (aka Cynthiana) vine submitted to our clinic by Clark McAllister (county agent in Lumpkin County), and the vine(s) were showing odd symptoms for Norton. Leaves were somewhat chlorotic, but the major concerning symptom was a ring spot on the leaves, along with spots on the shoots which are similar to those of…