ANTIBIOSE DE Spodoptera frugiperda (J.E. SMITH, 1797) (LEPIDOPTERA: NOCTUIDAE) EM GENÓTIPOS DE FEIJÃO CAUPI

Abstract

The species Spodoptera frugiperda (J.E. Smith) is an important pest of cowpea (Vigna unguiculata [L.] Walp.). However, few tactics are available for the management of this pest. Among these control tactics, the use of resistant or less susceptible plants is a more sustainable alternative and of great importance in Integrated Pest Management. The objective of this study was to evaluate the antibiosis of S. frugiperda in cowpea genotypes. The effects of the cowpea genotypes were evaluated throughout the development and survival of the insect by observing the biological parameters of S. frugiperda: duration of the larval, pupal and larva-adult stages, larvae weight at 12 days of age, pupal weight, adult sex ratio and fitness index. The experiment was conducted in a completely randomized design, with seven genotypes and twenty-five replicates for each of them. As a result, it was observed that the genotypes MNC11-1019E-12 and MNC11-1019E-46 demonstrated resistance characteristics by prolonging the development cycle of the pest. The genotypes MNC11-1019E-12, MNC11-1-22E-58 and MNC11-1026E-19 provided the lowest larval weight, negatively affecting the development of S. frugiperda larvae.