The inhibitory effects of sodium, potassium, and ammonium bicarbonates (NaHCO 3 , KHCO 3 and NH 4 HCO 3 , respectively) alone and in combination with SunSpray Ultra-Fine Spray Oil (SS) on powdery mildew, caused by Sphaerotheca fuliginea; gummy stem blight, caused by Didymella bryoniae; Alternaria leaf blight, caused by Alternaria cucumerina; and Ulocladium leaf spot, caused by Ulocladium cucurbitae, were studied. SS oil performed consistently better than ForEverGreen, Masbrane, Crop Life, Vapor Gard, Nu-Film 17, and Bio-Film for powdery mildew control in cucumber and pumpkin(.)
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O. Ziv (1992) studied this question.