Cucurbit downy mildew has been found on cucumber in Southeastern Pennsylvania in Berks county. Cucurbit downy mildew has also been reported in cucumber in Western NY as well as Eastern MD and DE on watermelon this past week. Weather conditions in the region have been ideal for its development. All cucurbit growers who have not initiated a weekly protectant fungicide program should do so immediately and consider adding downy mildew specific fungicides. For more information on the control of downy mildew in cucurbit crops please see the 2015 Commercial Fungicide Recommendations Guide.
July 8, 2015