Evaluación de dos productos de síntesis química y un biológico para el control de (Bactericera cockerelli Sulc), en el cultivo de papa (Solanum tuberosum L.), variedad fripapa.

Abstract

This investigation aimed to evaluate three insecticides with three different doses for the control of Bactericera cockerelli in the potato crop var. Fripapa in Florecer neighborhood, Maldonado parish, Riobamba canton. Three different active ingredients (a.i.) were used: indoxacarb, spinetoram and azadirachtin and three doses: 0.25, 0.50 and 0.75 L/ha, applied via foliar every 15 days after observing the incidence of the psyllid (60 das). For the statistical analysis of the variables plant height, psyllid nymph and adult counts, product efficacy, number of tubers, potato category, efficacy per application, phytotoxicity, yield and economic analysis were analized. On the other hand, a Bifactorial Completely Randomized Block Design was used with three replications, and treatment management through edaphic and foliar fertilization. The results obtained for the highest dose of 0.75 L/ha of Indoxacarb were more effective; however, Spinetoram with a dose of 0.25 L/ha was the treatment that obtained the greatest net benefit, while Azadirachtin with a dose of 0.25 L/ha got a higher Marginal Rate of Return (MRR), that is why it was the most economical treatment but the one with the lowest efficacy. It was concluded that Indoxacarb obtained the best efficacy for nymph control and Spinetoram for adult control, although its efficacy was reduced after consecutive applications until it lost its effect. Therefore, biological control is recommended, especially parasitoids of Bactericera cockerelli, which could complement the control of the pest.