Seed resistance of Phaseolus vulgaris to bean bug Acanthoscelides obtectus (Coleoptera: Bruchidae)

Abstract

Two varieties of bean (Phaseolus vulgaris), EMGOPA 202-Rubi and CNF 0010 harvested in 1989, were kept at room temperature (25 a 28^oC in the laboratory, close to each other, for a period of five years. The seeds of the two varieties were submitted to tests of detection and identification of insects, fungi and germinating power. One thousand seeds of each variety were analysed, and the results revealed that CNF 0010 had just one seed perfurated whereas 83.37% of EMGOPA 202-Rubi were perfurated by the bean bug (Acanthoscelides obtectus). By the same way, the variety CNF 0010 showed low contamination action of fungi, specially of Aspergillus glaucus. Germinating power of CNF 0010 was of 35.20%, and, of EMGOPA, 202-Rubi, 0%.