Cucurbit Downy Mildew Moves Towards Western North Carolina

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Cucurbit downy mildew has been reported in Haywood, Polk, Ashe, Henderson, and Chatham counties during this past week. Now that cucurbit downy mildew is present in several regions of North Carolina and surrounding states, its important that growers scout for the disease and keep up with preventive sprays to protect their crop and avoid yield loses.

If you are not familiar with cucurbit downy mildew symptoms on different cucurbits please see our previous alert to assist you in diagnosing this foliar disease. If you think you have cucurbit downy mildew in your cucurbits please contact your local Extension Agent and send photos and/or physical samples to the Plant Disease and Insect Clinic.

For more information about the disease and how to control it see our factsheets in english and spanish. Control recommendations are also available in the Cucurbit downy mildew IPM pipe website, where you can also register to recieve text, email and/or phone alerts when new disease outbreaks are reported. We have also compiled previous cucurbit downy mildew alerts here.

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Severe cucurbit downy mildew symptoms on cucumber leaf, note angular shape of yellow lesions. Older lesions turn brown and necrotic and start to coalesce loosing their characteristic angular shape and making the diagnosis difficult (Photo Debbie Roos, NCSU Extension Agent)

Severe cucurbit downy mildew symptoms on cucumber leaf, note angular shape of yellow lesions. Older lesions turn brown and necrotic and start to coalesce loosing their characteristic angular shape and making the diagnosis difficult (Photo Debbie Roos, NCSU Extension Agent)

Close up of initial cucurbit downy mildew lesions on cucumber leaf, note angular shape of yellow lesions (Photo, Travis Birdsell, NCSU Extension Agent)

Close up of initial cucurbit downy mildew lesions on cucumber leaf, note angular shape of yellow lesions (Photo Travis Birdsell, NCSU Extension Agent)

Close-up of cucurbit downy mildew "downy", dark (gray, black, brown) sporulation on backside of cucumber leaf (Photo, Travis Birdsell, NCSU Extension Agent)

Close-up of cucurbit downy mildew “downy”, dark (gray, black, brown) sporulation on backside of cucumber leaf (Photo Travis Birdsell, NCSU Extension Agent)

Written By

Photo of Dr. Lina Quesada-OcampoDr. Lina Quesada-OcampoAssistant Professor, Plant Pathology (Cucurbits and Sweetpotato) (919) 513-3530 lina_quesada@ncsu.eduEntomology and Plant Pathology - NC State University
Updated on May 6, 2016
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