CDM Diagnostic Key - Question 1 - Cucurbit Downy Mildew ipmPIPE

Cucurbit Downy Mildew (CDM) Diagnostic Key

Answer a series of questions to determine if CDM has affected your cucurbits.

Question 1: Are there yellow and/or tan to brown lesions on the upper leaf surface?

Yes

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

Fig 2. More advanced symptoms on CDM on cucumber (Beth K. Gugino, Penn State)

Fig 3. CDM on watermelon (Beth K. Gugino, Penn State)

Fig 4. CDM on cantaloupe (Beth K. Gugino, Penn State)

Fig 5. CDM on acorn squash (Beth K. Gugino, Penn State)

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