EFFICIENCY OF INSECTICIDES ASSOCIATED AT SULFUR IN THE CONTROL OF Spodotera frigiperda IN CORN

Abstract

The purpose of this study was to evaluate the effect of different insecticides with or without the association of sulfur in the control of S. frugiperda and the mortality of natural enemies present in corn. It was used a variety Al-Bandeirantes, with a population of 65,000 plants ha^{-1, in a randomized manner with 8 treatments and 5 replications. Each plot consisted of six rows spaced by 4.0 m to 0.45 m. The treatments were: 1) clorantraniliprole 25 g a.i. ha-1}; 2) clorantraniliprole 25 g a.i. ha^-1 + 1% sulfur; 3) triflumuron 24 g a.i. ha^-1; 4) triflumuron 24 g a.i. ha^-1 + 1% sulfur, 5) flubendiamide 60 g a.i. ha^-1; 6) flubendiamide 60 g a.i. ha^-1 + 1% sulfur; 7) sulfur 1%; 8) control (untreated). Insecticide applications were made when the level of control achieved (30% of plants shaved), with the use of a backpack sprayer, pressurized with CO₂, tipped with yellow jet type range (AXI110-02) with spray volume of 300 L.ha^-1. Evaluations were performed before and at 1, 3, 5, 10, 15 and 21DAA (days after application) in five plants each, which determined the number of larvae per plant and natural enemies. Data was analyzed by Tukey test and through the controlling of efficiency. It was observed that the use of sulfur can reduce the presence of caterpillars on plants, and when added to insecticides it showed a variable efficiency of control, always with positive characteristics of pest control. The insecticide clorantraniliprole had the highest efficiency in the controlling of S. frugiperda during the evaluations. The insecticides with the addition of sulfur were less harmful to D. luteipes and Orius sp.