FLUTRIAFOL E AZOXISTROBINA: UMA COMBINAÇÃO EFICIENTE PARA O CONTROLE DE DOENÇAS FOLIARES FÚNGICAS NA CULTURA DO MILHO

Abstract

The present work had the objective of evaluating the performance of a new fungicide formulation containing the active compounds azoxystrobin and flutriafol (AZXFLT) in the control of fungal foliar patches in corn. Three experiments were carried out: the first two in the second harvest of the agricultural years 2015 and 2016, and one in the first crop of the agricultural year 2016/2017. The area below the turcicum rust, polyssor rust and cercosporiae growth curve in the year 2015, white spot, polyssora rust and diplodia in the year 2016 and cercosporiae, turcicum spot and white spot in the year 2016, besides the productivity and economic viability of each treatment. The experimental design was in a randomized block with four replicates. In the year 2015, the AZXFLT formulation was evaluated at a dose of 0.5 L p. w. ha-1 in two applications, 0.6 L p. w. ha-1 in one and two applications comparing it with the formulations azoxystrobin + cyproconazole and pyraclostrobin + epoxiconazole in two applications. In the year 2016, AZXFLT was evaluated separately and in association with mancozeb, chlorothalonil, copper hydroxide, copper phosphite, diphenoconazole and propiconazole, these treatments being compared to pyraclostrobin + epoxiconazole and its association with mancozeb, all in two applications. In the 2016/2017 harvest, AZXFLT was evaluated in an application at the dose of 0.6 L p. w. ha-1 at the vomiting stage (VT) and an application with eight leaves developed (V8) and in two applications at doses of 0.6 L p. w. ha1 and 0.5 L p. w. ha-1 and its association with pyraclostrobin + epoxiconazole in two and three applications (15 days after the pumping stage), comparing azoxystrobin + cyproconazole and pyraclostrobin + epoxiconazole in two applications. In all the tests, there was an absolute control without application of fungicides. All fungicides reduced the AACPD of all diseases and provided an increase in productivity, with positive financial returns. However, the treatments with AZXFLT in two applications of 0.6 L p. w. ha-1. The use of protective fungicides responded in productivity and economic viability helping to manage resistance.