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Increased Risk for Powdery Mildew in San Joaquin Valley Vineyards

Because of severe powdery mildew pressure last year and heavy winter rains, Western Farm Press suggests growers in the San Joaquin Valley prepare for increased disease risk in grapes this year.

University of California Extension reports powdery mildew is best managed through early reduction of inoculum and maintaining a suitable treatment regimen. Chlorotic spots on the upper leaf surface are the first signs of powdery mildew, followed by white mycelium on the lower leaf surface. When spore production begins, the areas infected by the pathogen begin to take on the powdery white appearance from which the disease gets its name.

Syngenta offers fungicides that help control powdery mildew in grapes, such as Inspire Super® and Quadris Top® fungicides. Both Inspire Super and Quadris Top possess preventive and curative properties and offer rapid uptake into plant tissues with systemic and translaminar movement.  As with most diseases, it is easier to use preventive treatment than to try and rescue grapes from established infections.

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