Cucurbit Downy Mildew Found in Franklin County, North Carolina

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Cucurbit downy mildew was confirmed on a cucumber sample from a commercial field in Franklin County submitted to the Plant Disease and Insect Clinic on June 23 of 2014.  Leaves presented approximately 20% disease, but only 1% of the field was affected (Figure 1 and Figure 2).

Figure 1: adaxial side of a cucumber leaf showing downy mildew symptoms (Charles Mitchell, N.C. Cooperative Extension)

Figure 1: adaxial side of a cucumber leaf showing downy mildew symptoms (Charles Mitchell, N.C. Cooperative Extension)

Figure 1: abaxial side of a cucumber leaf showing downy mildew sporulation (Charles Mitchell, N.C. Cooperative Extension)

Figure 2: abaxial side of a cucumber leaf showing downy mildew sporulation (Charles Mitchell, N.C. Cooperative Extension)

This is the second report of cucurbit downy mildew in North Carolina for 2014, and several outbreaks are being reported in neighboring states.  Active scouting and immediate action to protect cucurbit crops is recommended.  Please refer to our previous alert for control recommendations.

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. If cucurbit downy mildew is confirmed in your samples by an expert, please make sure a report is sent to the Cucurbit downy mildew IPM pipe website.

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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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