RESISTÊNCIA DE GENÓTIPOS DE Phaseolus vulgaris A Zabrotes subfasciatus (Bohemann, 1833) (Chrysomelidae: Bruchinae)

Abstract

Zabrotes subfasciatus popularly known as bean weevil is an important pest found during grain storage. The chemical insecticides use has been the most efficient way of insect control, but it is highly toxic and costly. With this, the resistance of different Phaseolus vulgaris genotypes was evaluated. Ten genotypes were used in tests with and without choice. The experiments were carried out at the IF Goiano – Campus Iporá Entomology Laboratory, with four replications. Viable, unfeasible and total eggs, dry mass consumed and insect dry mass, egg-to-adult female, male and total (female + male) period, male and female longevity, sex ratio, adults emerged number (female, male and total) and adults emerged percentage were evaluated. It was also performed analysis of the integument thickness and oviposition of the first generation of insects from the test with no choice. The obtained results were submitted to the variance test (test F), comparing the means by the Skott-Knott test. The results found that the Arc 1 genotype presents antibiosis resistance on Z. subfasciatus, and larger integument thickness provides lower adults emergence.