Aplicações de epoxiconazol + piraclostrobina no controle de doenças de sorgo sacarino BRS 506 e BRS 511

Abstract

The aim of this work was to evaluate the fungicide effect epoxiconazole + pyraclostrobin in different applications on saccharine sorghum, and correlate the disease intensity to sugar production. The experiment was conducted under field conditions, in the UFGD Experimental Farm, 2015 year. Disease severities and agronomic characteristics were evaluated .The evalueted pathogens were the Exserohilum turcicum, Colletotrichum graminicola, Puccinia purpurea, Bipolaris sorghicola and Cercospora fusimaculans. The agronomic characteristics evalueted were the plant height (m), stem diameter (mm), broth volume L ha-1 and total soluble solids (oBrix). The experiment was conducted in a completely randomized design, within each cultivar, with four replications. The treatments consisted of 0,75 L ha-1 comercial product dose application of epoxiconazole + pyraclostrobin, in the following schemes: T1 = untreated, T2 = 1 application (45 days after emergence (DAE)), T3 = 2 applications (45 and 66 DAE) and T4 = 3 applications (45, 66 and 87 DAE). The plots consisted of seven lines of five meters, spaced 0.45 m between rows. The chemical control of sorghum diseases is a viable strategy to control the main culture diseases and it showed effects on interesting agronomic characteristics, such as oBrix.