ANDREIA VANESSA DA SILVA
Abstract:
The physiological effects of fungicides from the group of strobilurins were initially described for kresoxim - methyl molecule in wheat crop currently, the effects of strobilurins are reported by several authors in various crops such as soy, beans, tomatoes and corn. In order to evaluate the effects of pyraclostrobin fungicide, which belongs to the group of strobilurins applied at different periods on three corn genotypes. Were conducted two similar experiments, in the agricultural year of 2014/15, one being cultivated on season and other one off season, located in Jataí city, southwest of Goiás State. In both was used 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. Were evaluated: nitrate reductase enzyme activity, chlorophyll index, percentage of senescent leaves, area under the disease progress curve, morphological characteristics, yield components and productivity. The results were submitted to variance analysis and means were compared by Tukey test by 5% probability. Both for the experiment on season as off season there were no interaction between genotype and applications for the variables evaluated, the only interaction was for the area under the disease progress curve cercospora spot in the on season. It was not observed pyraclostrobin application effects on physiology, development and productivity of corn plants grown on season and off season.
