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Ctpumpkin@optonline.net

Because it's turning out to be one of those years!
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Thomas A. Zitter
Professor, Department of Plant Pathology
Cornell University, Ithaca, NY 14853

Powdery Mildew:

ID: Podosphaera xanthii (formerly Sphaerotheca fuliginea) and Erysiphe cichoracearum Produces white powdery colonies on upper and lower leaf surfaces, on stems and petioles. (visible with the naked eye)

Cultural Practices: Choose PM tolerant varieties for cucurbit of interest if available. (HAH! -SJ)

Chemical Control: Management of chemicals use for control is critical; refer to Table 1 and *make sure to tank mix* protectant fungicides (Group M5, M3, M1 or other chemicals (chlorothalonil, maneb, mancozeb, copper, oil, sulfur, etc.) with a strobilurin (Group 11); or with demethylation inhibitors (Group 3) or thiophanate-methyl (Group 1) and follow alternation protocol. If resistance to Quadris occurs in the area, you must use a fungicide from different fungicide group.

http://vegetablemdonline.ppath.cornell.edu/factsheets/Cucurbits_PM.htm

7/26/2004 9:56:23 PM