Evaluación de la aplicación de elicitores y bioproductos para el control de mildiu (Pseudoperonospora cubensis berk. & m.a.curtis) en pepino (Cucumis sativus L.)

Abstract

The application of elicitors and bioproducts for the control of downy mildew (Pseudoperonospora cubensis Berk. & M.A.Curtis) on cucumber (Cucumis sativus L.) under greenhouse conditions was evaluated. The methodology consisted on seven treatments with five replications, the first two were with the elicitors salicylic acid (T1) and silicon (T2), the next two with the bioproducts Trichoderma+Bacillus (T3) and Bacillus subtilis (T4), T5 consisted on a variety of chemical products with different active compounds, while T6 was the control consisting of the application of only water; In addition, the variables incidence, severity, productivity, Area Under the Disease Progress Curve (ABCPE), biological efficacy, as well as a benefit/cost analysis were analyzed. The application of salicylic acid as an elicitor resulted in more flowers (0.27 flowers) and fruits (1.37 fruits), while the chemical treatment favored fruit yield per plant up to the eighth week (4.68 kg/plant); in addition, the latter had a higher profitability with 42%. It was concluded that the chemical treatment generated better results in most of the variables under study, followed by salicylic acid; therefore, the use of chemical products is recommended to reduce the incidence and severity of downy mildew in cucumber under greenhouse in Tunshi community.