Cucurbit Downy Mildew Reported in NC

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From Erin Eure
Area Specialized Agent, Agriculture – Commercial Fruits & Vegetables
 
Attention Cucurbit Growers:
Cucurbit Downy Mildew was reported on cucumbers yesterday in NC (Duplin Co). Growers are advised to scout for the disease and initiate preventative sprays immediately, especially if the weather continues to be cool and wet.
For a preventative spray program, products like chlorothalonil and mancozeb are good broad spectrum protectants that can be rotated. Products like Gavel (contains mancozeb), Tanos, and Zampro can be tank mixed with these, as appropriate, and may be a good idea to add in on cucumbers that are more susceptible to this disease. Applications should be made every 7 days on cucumber, every 10 days on other cucurbits.
After disease is confirmed, growers are advised to and rotate between Ranman, Previcur Flex, and Orondis Opti A in their tank mix with chlorothalonil or mancozeb. Apply every 5 days in cucumber, every 7 days in other cucurbits.
Please contact me if you suspect CDM is present in your field, or if you would like help in selecting a product specific to your farm’s spray program.
Erin Eure, Area Specialized Agent, Agriculture – Commercial Fruits & Vegetables