AJUSTE DA COMBINAÇÃO DE ACIBENZOLAR-S-METIL E COBRA NO CONTROLE DA MANCHA BACTERIANA NO TOMATE DE MESA E RETORNO ECONÔMICO

Abstract

This paper aimed to adjust acibenzolar-S-metil (ASM) and copper combination in the bacterial leaf spot (Xanthomonas perforans) control in fresh tomato and its financial return in different management programs. Two field trials were carried out in Goiânia and Abadiânia, Goiás State, Brazil, in 2018 and in 2018-2019, respectively. The disease was induced in the first trial using artificial inoculation of a Xanthomonas perforans inoculum suspension, and it occurred naturally in the second trial, in which this species was also found. The treatments evaluated were number of weekly ASM applications (zero, seven, nine, eleven, and thirteen), the mix ASM + AN2811, Amino Acid and Nutrient Leaf Fertilizer in thirteen applications, the copper oxychloride standard (Recop®840WP) applied weekly throughout the cycle, and the mix of ASM + Copper oxychloride in nine applications. The commercial product doses used were ASM (5 g 100 L-1), Copper oxychloride (300 g 100 L-1), and leaf fertilizer (100 mL 100 L-1). As the treatment applications containing ASM were being concluded, complementary copper oxychloride applications were carried out weekly until the thirteenth week. The severity of the disease, on the seventh day after that week, and the total production and commercial fruit classification were evaluated. Besides these variables, benefit cost ratio (B/C) was calculated considering the increase of treatment in relation to the untreated control. Analysis of variance, regression, and orthogonal contrasts were carried out. As the number of ASM applications increased, disease severity decreased, although, the best B/C ratio was obtained with seven applications of ASM, followed by Copper applications until the end of the cycle.