Controle químico de manchas foliares no milho, incidência de grãos ardidos e produtividade

Abstract

Corn is an important cereal used worldwide for human and animal food. Its second crop cultivation has been affected by the increase in disease severity and compromising grain quality. The objective was to determine the efficiency of fungicides in the control of foliar diseases, burnt grains and corn yield. The experimental design used was the DBC with 16 treatments and four replications using the hybrid DKB 390 PRO3. Different fungicides from the chemical groups of triazoles, carboxamides and strobilurins were evaluated in two applications, at the V6 stage (six developed leaves) and pre-tadding, totaling 16 treatments. The variables analyzed were: control of diplodia spot (Stenocarpella macrospora) and polysora rust (Puccinia polysora), stem dry matter weight, pathology analysis of burnt grains and yield. The results showed that fungicides containing formulations based on carboxamides were more efficient in the control of diplodia leaf spot (Stenocarpella macrospora) and polysomal rust (Puccinia polysora). The treatments with a triple mixture of carboxamide, triazole and strobilurin were more efficient, resulting in the control of diplody spot on the leaves and, consequently, greater integrity of the stems. The main species causing burnt grains in this work were Stenocarpella macrospora and Fusarium spp.