Abstract
The biocompatible products AQ10 (hyperparasitic fungus Ampelomyces quisqualis), JMS Stylet-Oil (medium viscosity mineral oil), M-Pede (potassium salts of fatty acids) and Kaligreen (82% potassium bicarbonate) suppressed powdery mildew ( Sphaerotheca fusca) on winter squash, muskmelon, and pumpkin and increased yield compared with nontreated plants under field conditions. Applications were started after disease detection. JMS Stylet-Oil most effectively controlled powdery mildew. However, these products did not provide the degree of full-season control or yield increase obtained with the conventional fungicide program of Bravo (chlorothalonil) plus Nova (myclobutanil). For example, in muskmelon on 17 August 1995, 7 days after the third application, powdery mildew severity on upper and lower (under) leaf surfaces was 66 and 80% for untreated, 3 and 13% for Bravo plus Nova, 43 and 44% for JMS Stylet-Oil, 38 and 65% for AQ10, and 53 and 65% for Kaligreen, respectively. Yield (ton/ha) was 22.8, 44.2, 36.4, 40.6, and 38.5, respectively. Sucrose content was 3.5%, 6.6%, 4.6%, 3.2%, and 4.0%, respectively.
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