Resposta a aplicação de fungicidas para redução de grãos ardidos em um híbrido de milho doce

Abstract

Sweet corn is characterized as a vegetable, used exclusively for human consumption. One of the characteristics that distinguish sweet corn from others is the presence of sugary and shrunken genes which are responsible for changes in quality, such as taste, seeds viability and the aspect of the plants and the mature ears. However, associated with these genes are undesirable characteristics including low productivity and low resistance to pests and diseases. The Ear Rot stands out among the main diseases that attack the corn ear and the grains, causing losses in productivity, quality and food health due to the formation of rot grains which are caused by fungis. Although the use of genetic control is important, the use of chemical control through fungicides applications is necessary. The aim of this study was to evaluate the application of different fungicides in the reduction of rot grains in a sweet corn hybrid and their implications for grain yield. The experiment was conducted in Uberlândia/MG, during the summer season. The experimental design was made by randomized blocks, consisting of 8 treatments and the conventional hybrid used was GSS2577. The characteristics evaluated were final stand, plant height, ear insertion height, percentage of rotten ears and net and gross productivity. Finally, it was observed that the use of fungicides contributed to reduction of rotten ears likewise the addition of a carboxamide and a benzimidazole, combined with other molecules, resulted in a reduction of the rotten ears percentage and an increase in grain yield. Furthermore, the T8 treatment expressed a positive result to productivity, percentage of rotten ears and consequently net productivity.