Control of powdery mildew on pumpkin (Cucurbita pepo L.) under greenhouse conditions
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Abstract
The objective of this study was to define the optimal concentrations and timing of applications of oils, mineral salts, and biological control agents for powdery mildew management in squash (Cucurbita pepo L. cv. ‘Grey Zucchini’) under greenhouse conditions. After seven days of seed germination, the true leaves of the seedlings were removed and only the cotyledons remained. They were then inoculated with the pathogenic fungus, and three concentrations of the products were applied at two time: preventively or curatively. At the doses evaluated, the preventive applications of any of the products (oils, mineral salts, or biological control agents) showed some effect on the disease, and the disease severity did not significantly differ from the control. Compared with the control, which showed 80.93%, the curative treatments showed 41.67% and 71.43% disease severity with significant differences at medium concentrations for oils and low concentrations for salts (10 ml.L-1) and (2 g.L-1), respectively. On this basis, the curative applications for oils and salts were selected, with the intermediate concentration (10 ml.L-1) for the former and the minimum concentration for the latter (2 g.L-1, 2 ml.L-1).
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