Abstract

YANEZ JUAREZ, Moisés Gilberto et al. Mineral salts for control of powdery mildew (Oidium sp.) in cucumber. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.7, pp.1551-1561. ISSN 2007-0934.

The impact of mineral salts potassium phosphite (6 mL L-1) phosphite calcium (10 g L-1), potassium sulfate (17 g L-1) and calcium nitrate (20 g L-1) was assessed on powdery mildew caused by Oidium sp. in cucumber cultivation. The experiment was established in greenhouse conditions under design randomized complete block with six replicates per treatment. The direct sowing, cucumber plants (Cucumis sativus L.) cv 'Zapata' were grown in plastic bags with a capacity of 4.5 kg and coconut substrate (70% coarse fiber and 30% fine fiber); when plants (two per pot) had five true leaves, they were applied to foliage treatment solutions with a manual atomizer, five times at intervals of 7 days. The powdery mildew infection in plants evolved naturally. The plant height, leaf number, leaf area, leaf greenness, number of diseased leaves and incidence and severity of powdery mildew was evaluated. There was no significant difference (p≤ 0.05) in the variables height, leaf area, greenery and number of leaves in plants evaluated. The greatest protection against powdery mildew (Oidium sp.) was obtained with the application of calcium nitrate and potassium phosphite, phosphite surpassing that provided by calcium and potassium sulfate. Calcium nitrate and potassium phosphite in doses of 20 g and 6 mL L-1 water, respectively, are an alternative for handling powdery mildew in cucumber.

Keywords : Cucumis sativus; calcium nitrate; potassium phosphite.

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