Objective with this study evaluate the physiological effects, disease control and effects on the production components of pyraclostrobin fungicide, applied at different phenological stages of of second crop corn genotypes, in Jataí city. In randomized blocks in a factorial design 3 x 4 with four replications. The treatments consisted in three corn genotypes and four periods of pyraclostrobin application. There was no interaction between genotype and applications for the variables evaluated. For the majority of the variables the only difference were between genotypes. The application of pyraclostrobin does not interfere in the physiology, development and grain production of maize plants grown in second crop and there was no significant difference in the control of polissora blight,cercospora spot, bipolaris spot stain and white stain by the application of pyraclostrobin in the genotypes studied.
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