Eficácia de diferentes aplicações do grupo das piridazinas pirazolcarboxamidas no controle de Dalbulus maidis e Rhopalosiphum maidis na cultura do milho

Abstract

Mayze (Zea mays L.) is a fundamental product for Brazilian agriculture, cultivated in all regions of the country, present in more than two million agricultural establishments. In recent decades, the crop has undergone profound transformations, with a notable reduction in its role as a subsistence crop for small producers and an increase in its role in efficient commercial agriculture, accompanied by geographic and temporal shifts in production. Among the various factors affecting corn productivity, pests are one of the main causes of yield losses. The number of insect species attacking corn is highly significant, but only a portion of them cause substantial damage, with the corn leafhopper and corn aphid standing out as major pests due to their ability to infect plants with viruses and mollicutes. This study aimed to evaluate the effect of different applications of the pyridazine pyrazolecarboxamides group in controlling sap-sucking insects in corn cultivation, under second-season conditions with an experiment set up in Uberlândia/MG during the 2024 crop year. The experimental design was a randomized block design (RBD), with five treatments and sixteen replications, including a control treatment with no application, one treatment with only conventional insecticides, and the other treatments with combinations of the new chemical group for controlling sap-sucking insects in corn. Plant height, ear insertion height, final stand, and grain yield were evaluated. Analysis of variance and Tukey's test at a 0,05 significance level were conducted using the Sisvar statistical software. All treatments with insecticide applications were effective in managing sap-sucking insects, maintaining the hybrid corn's productive potential, and showed statistical differences in yield. Treatment T5 (Efficon® (3x) V2-V4-V6 / Conventional sap-sucking insecticides (4x) V8-V10-VT-R2) achieved the highest average yield of 6,562.9 kg.ha-1.