Today, I observed downy mildew for the first time this year. It was on Lenoir vines in west Georgia, and this indicates that producers should be scouting for it throughout the state. In addition, if you have not already done so, I would consider incorporating highly efficacious materials such as Zampro, Revus, Ridomil Gold MZ (note the pre-harvest interval), etc. in spray programs as we move forward — especially under the wet conditions we have been observing. Downy mildew spores can infect within a few hours when leaves or fruit are wet. You definitely want to have good protection against this disease as we progress through the remainder of the season. Initial symptoms of downy mildew are “oil” spots on the upper leaf surface with white, fluffy spore formation on the leaf underside. See below for an example leaf from today.

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