Cucurbit Downy Mildew Update – August 19, 2011

Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu

There were reports of downy mildew on pumpkin in northern New Jersey at the beginning of the week. This was sent to the WCU mailing list to make you aware that downy mildew was beginning to appear on more than just pickling cucumber in the area. With the recent thunderstorms, cooler nights and morning fog, conditions will be more favorable for disease development. Maintain your fungicide program at this time. Growers should be aware that the fungicides that have been the most effective on downy mildew on cucumber (namely Presidio, Ranman, and Previcur Flex) will also be very effective on pumpkin, cantaloupe and any other cucurbit. Tanos and Curzate could be added to that list as well for cucurbits other than cucumber. Be aware that Presidio has some plant back restrictions for crops not on the label. The link will take you the new supplemental label: http://agdev.anr.udel.edu/weeklycropupdate/wp-content/uploads/2011/08/PresidioSupplementalLabel.pdf. Wheat can be planted 30 days after treatment. This was added in the supplemental label.

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