Desempenho de milho ao manejo químico em diferentes épocas de aplicação, em safra verão

Abstract

Corn is a vital cereal in Brazil and worldwide, with significant economic importance. Its adaptability makes it vulnerable to diseases and pests, especially with the expansion of cultivated areas. The main threats include bipolaris leaf spot, diplodia leaf spot, and corn leafhopper, which can lead to substantial productivity losses. To protect corn hybrids, using fungicides and insecticides from different chemical groups is an effective strategy. The objective of this study is to evaluate the productive performance of a corn hybrid based on the use of foliar insecticides and fungicides applied at different times during the 2023/2024 summer crop season. The experiment was conducted in Uberlândia/MG during the first crop period of the 2023/2024 agricultural year, using the commercial hybrid MG593 PWUltra. The experimental design was a randomized block design (RBD), with eleven treatments and six replications, including one control without the application of fungicides and insecticides, and the other treatments with different combinations of foliar fungicides and insecticides.The evaluated characteristics included final stand, plant height, ear insertion height, and grain productivity. Using the statistical program SISVAR, analysis of variance and Tukey's test were performed. The combination of foliar insecticides and fungicides provided significant results in controlling the pathogens, maintaining the photosynthetically active area of the corn and enhancing the productive potential of the tested hybrid. Treatments T9 (Verdavis® (3x) / Conventional sucking insecticides (4x) / Orkestra® V4 / Priori Xtra® V8 / Melyra® VT-R2) and T11 (Verdavis® (3x) / Conventional sucking insecticides (4x) / Orkestra® V4 / Priori Xtra® V8 / Belyan® VT-R2) resulted in the highest increases in grain productivity compared to the other treatments.