Scientific Electronic Archives (Oct 2017)
FUNGICIDES IN SECOND HARVEST CORN: CERCOSPORIOSE CONTROL AND BLOTCH, PRODUCTIVITY, ECONOMIC RETURN AND GRAIN QUALITY
Abstract
Os objetivos desse trabalho foram avaliar a eficiência de The aim of this study was evaluate efficacy fungicides to control cercospora leaf spot (Cercospora zeae-maydis) and helminthosporium leaf blight (Exserohilumturcicum), productivity, economic returns and quality of grain of corn culture of second crop in Farm Bandeirantes at Feliz Natal/MT. The treatments evaluated were: pyraclostrobina+epoxiconazol (0,7 L ha-1), trifloxistrobina+protioconazol (0,3L ha-1), azoxistrobina+cyproconazol(0,3 L ha-1), azoxystrobina (0,25 L ha-1), trifloxistrobina+ciproconazol (0,2 L ha-1) and control. Theapplicationof products occurred when corn was with 55 days, with a high propelled sprayer. The experimental design was a randomized block, with 6 treatments and 3 replications. The severity of each disease was visually determined through periodic analyses and ten plants were marked in each repetition, which were evaluated during the entire crop cycle. The data of severity obtained were used to calculate the area under disease progress curve (AUDPC). It was also obtained the production per ha, the economic return (R$ ha-1) and physiological quality of grain was evaluated by germination tests and accelerated aging of the grains. All treatments had significant difference compared to the control sample in controlling cercospora leaf spot about the control of helminthosporiumleat blight, the fungicides trifloxystrobin+prothioconazol and trifloxystrobin+cyproconazol were not efficient, and the fungicides pyraclostrobina+epoxiconazol, azoxystrobina, azoxistrobina+cyproconazol were efficient. The treatments that had major production are from the group of triazoles+strobilurine and the fungicide pyraclostrobin+epoxyconazol showed greater economic viability. Not were differences among fungicides, and neither of the treatments compared to control, in germination and accelerated aging tests, showing that the grains have good quality characteristics
