Número de aplicações no controle da mancha bipolaris na cultura do milho

Abstract

The level of technology used to grow safrinha corn allows it to expand into new agricultural areas. These conditions, combined with other factors such as seeding system, sowing time, and crop rotation, as well as the choice of corn hybrids, can affect the incidence and severity of crop diseases. The use of fungicides is one of the practices to prevent infection, but their indiscriminate use and lack of knowledge of application technology contribute to the low efficiency of products in controlling diseases. White spot, turcicum spot and rust are among the main foliar diseases that occur in corn crops. Under favorable environmental conditions and with the use of susceptible hybrids, foliar diseases can reduce corn productivity by more than 50%, reducing the photosynthetically active area. Although traditionally the use of fungicides in corn has not been as comprehensive, the high inoculum pressure and potential for disease damage suggest that phytosanitary management of fungicides is essential for good corn yields, especially in high-technology areas. In the decision-making process for applying fungicides to corn crops, the identification of diseases that predominate in the crop throughout the harvest must be considered