Uso de azoxystrobin + cyproconazole no controle da mancha parda, ferrugem alaranjada, mancha anelar e da podridão vermelha da cana de açúcar

Abstract

Sugarcane productivity is influenced by edaphoclimatic conditions and biological factors, especially diseases. Given the relevance of sugarcane cultivation to Brazil and the scarcity of studies on secondary diseases in the crop, it is essential to detect the main symptoms and the search for control of these diseases that are increasingly affecting negatively this culture. In this context, the objective of this work was to evaluate the damage caused by diseases importance in sugarcane crop. The study was conducted at the experimental station JULIAGRO - Bioproducts, Genetics and Plant Protection Ltda., highway BR-365, located 10 km from the city of Uberlândia-MG. The design was a complete randomized block with five replications for each treatment. The severity was assessed and then the area under the disease progress curve (AACPD) of the following diseases was calculated: brown spot, orange rust, ring spot and red rot. The variables evaluated submitted to analysis of variance (ANAVA) and then to the mean comparison test proposed by Tukey (1953), with P <0.05. The cultivar SP813250 was susceptible to the diseases evaluated in the present experiment. The highest efficiency level was observed by using the combination of Azoxystrobin + Cyproconazole at 200 + 80 g / ha, with 5 applications in 30 days, providing a lower level of maximum severity.