Evaluación de productos alternativos para control de mildiu velloso (Pseudoperonospora cubensis) en el cultivo de pepinillo (Cucumis sativus L.) bajo cubierta plástica

Abstract

Currently, the gherkin crop (Cucumis sativus L.) has been affected by a harmful fungus known as downy mildew (Pseudoperonospora cubensis), causing economic losses to growers, since it mainly affects the foliage of the plant, causing irregular yellow spots on the upper side of the leaf, while on the underside, the development of mycelium and sporangia can be observed. Over time, the spots become necrotic, causing the leaves to fall and die, seriously affecting quality and production. The present research was based on the control of this pathogen with the objective of controlling downy mildew (Pseudoperonospora cubensis) in gherkin (Cucumis sativus L.) by applying two alternative products. A completely randomized block (DBCA) design was used, with 2 x 2 + 1 group factor analysis, with 3 replicates and Tukey's significance tests at 5% for comparison of averages were also performed. The variables evaluated were incidence percentage, severity percentage, weight, length, diameter and yield. The products used were Nimrod (P1) and Hidrozoil (P2). The product Hidrozoil at a dose of 4cc/l (D2), obtained the best results in terms of incidence and severity reduction, presenting incidence values of 26,67% and severity of 2,89%, due to the fact that Hidrozoil is composed of vegetable oils and ozone, generating at the same time an organic product, with good assimilation due to its great disinfectant antioxidant action against phytopathogenic fungi, achieving a reduction in incidence and severity. As for the control, it was visualized that there was an increase in the disease because it was not treated with any product. In terms of weight, length and diameter, there were no significant differences, and in yield, P2 (Hydrozoil) was the one that stood out in comparison to P1. In the economic analysis it was concluded that the treatment P2D1 (Hydrozoil at a dose of 2cc/l), presented the highest net benefit of $ 5,02 dollars, being the most profitable treatment from the economic point of view for the farmer.