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Cucurbit downy mildew confirmed in Southern New Jersey

Posted: June 29, 2011

Although there are no confirmed reports of cucurbit downy mildew in PA, nearby outbreaks remind us that we need to be on the lookout!
Symptoms of cucurbit downy mildew on the upper leaf surface of cucumber (Photo: Beth K. Gugino).

Symptoms of cucurbit downy mildew on the upper leaf surface of cucumber (Photo: Beth K. Gugino).

This morning, downy mildew was confirmed on cucumber in a commercial field in Southern New Jersey by Andy Wyenandt, Vegetable Pathologist at Rutgers. At this time it is important to continue to vigilantly scout fields for downy mildew. The risk of pathogen spread from the outbreaks in NJ, NC and SC is very low due to the drier sunny weather forecasted over the next few days however the scattered showers and storms in the long-range forecast next week may create more favorable conditions for pathogen spread. Remember that there is a 5 to 7 day latent (waiting) period between when the spores land on the plant and the development of symptoms. Consider initiating a protectant fungicide spray program for cucumbers, the most susceptible of all the cucurbit types.

Please visit the Cucurbit Downy Mildew Forecasting website (http://cdm.ipmpipe.org/index.php) for the latest list of disease outbreak locations and forecasts. This information is updated by the end of the day on Monday, Wednesday and Fridays. Please report any suspected cases of cucurbit downy mildew to your local Penn State Cooperative Extension office or contact Beth Gugino at 814-865-7328 or bkgugino@psu.edu.