Powdery downy is the most important disease in parthenocarpic cucumbers kept under protected cultivation in the northern region of Paraná State-Brazil during low-humidity periods. The characteristics of this agrosystem proved favorable conditions for the adoption of alternative measures to control this disease. Thus, five alternative products were evaluated for powdery mildew control in the parthenocarpic cucumber 'Hokushin' under protect cultivation: raw cow's milk, neem oil, acibenzolar-S-methyl, poultry litter water extract, citric extract (Ecolife® 40) and the fungicide azoxystrobin, at the following concentrations (active ingredient per liter of water): 50.0 ml; 5.0 ml; 0.025g; 2.0 ml, 1:2 v/v. dilution, and 0.06g, respectively. Neem oil led to the best results with control efficiency higher than of azoxystrobin (36.8 and 27.8%, respectively). Poultry litter extract and Ecolife had the worst performance, with 6.5 and 10.5% control efficiency, respectively.
Oidium sp.; Cucumis sativus; powdery mildew
