RESISTÊNCIA DE GENÓTIPOS DE FEIJÃO-CAUPI A CALLOSOBRUCHUS MACULATUS (FABR.)

Abstract

Among the pests that attack the cowpea (Vigna unguiculata) crop, the weevil Callosobruchus maculatus is considered the pest with the highest rate of relevance in the storagestage. There are several control alternatives for C. maculatus, but the one with better accessibility, economy and viability is the use of resistant cultivars, a sustainable and easily accessible alternative for the producer profile in the west region of Goiás. The intention of this study was to identify genotypes resistant to C. maculatus. The experiments were carried out at the Entomology Laboratory of the IF Goiano – Campus Iporá. For this purpose, ten cowpea genotypes were used in tests with and without a chance of choice with 4 and 5 repetitions, respectively. Viable, non- viable and total eggs, dry mass consumed, and dry mass consumed perinsect, period from egg to adult of female, male and total (female + male), male and female longevity, sex ratio, number of emerged adults were evaluated (female, male and total) as well as the percentage of emerged adults and oviposition of the first generation of insects from the no-choice test. The data were submitted to the variance test (Test F), comparing the means by the Tukey test at 5% probability. With the results it was possible to conclude that the BRS Milênio genotype presents non- preference resistance to C. maculatus, in the free choice test, the IT81D1045 genotype presents resistance of the antibiosis type, the BRS Pajeú has moderate resistance of the antibiosis type and BRS Guariba proved to be the most susceptible to attack by C. maculatus.