CDM Diagnostic Key - Question 1 - No - Cucurbit Downy Mildew ipmPIPE

Lesions on the upper leaf surface can be subtle so check and see if there is water soaking on the lower leaf surface as shown in Fig 6.

If no leaf lesions are present, the plant may have another disease or disorder. Consult with your local Extension office for aid in diagnosis.

Fig 1. Early CDM symptoms on cucumber (Beth K. Gugino, Penn State)

Fig 6. Watersoaking on the lower leaf surface (Beth K. Gugino, Penn State)

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The forecast(s) presented in this report only represent estimates of pathways spores are likely to travel from confirmed sources. The forecasts were prepared for purposes of supporting the research and extension functions of North Carolina State University. The forecasts contained herein were not prepared or issued in support of business, industrial, or investment decisions whether they are profit-making or otherwise. The authors; the Department of Plant Pathology; Department of Marine, Earth, and Atmospheric Sciences; North Carolina State University; The University of North Carolina, their Governors, Trustees, officers, administrators, employees, and agents do not assume any responsibility for any interpretations of the data, nor do they warrant the fitness of the forecasts for any use.

NOTE: These forecasts/outlooks apply ONLY to disease development from AIRBORNE TRANSPORT of spores. We do not have the capability to track cucurbit downy mildew development by other means, such as transporting infected materials, nor will we attempt to do so. Please consult the County Extension Service personnel in your area if you have questions about these matters. ***

CDM Diagnostic Key – Question 1 – No