EFICIÊNCIA DO ACIBENZOLAR-S-METIL NA PROTEÇÃO DE PLANTAS DE INHAME À Curvularia eragrostides

Abstract

The effect of the plant resistance inducer acibenzolar-S-methyl on in vitro mycelial growth and sporulation of Curvularia eragrostides was evaluated, as well as the time and dosage of its application for the pathosystem yam x C. eragrostides. Five concentrations: 250; 125; 62.50; 31.25 and 15.12 ppm were evaluated for mycelial growth and sporulation of C. eragrostides. The ASM was sprayed onto the leaves of yam plants, at a concentration of 10 g, 20 g, and 30 g of the active ingredient (i.a.) per 100 liters of water, at time intervals of 10, 15, and 30 days before pathogen inoculation. Mycelial growth and sporulation of C. eragrostides was not affect by ASM, at the concentrations of 62.5; 31.25, and 15.12 ppm. Application of ASM was most effective at the dose of 15 g a.i./100 l of water, at 15 days before pathogen inoculation, providing protection against C. eragrostides, with a decrease of up to 76.15 % in yam leaf spot severity.