Abstract
We checked the infestation resistance of various beans of the genus Vigna, using 5 species of bean weevils, Callosobruchus chinensis, C. maculatus, C. analis, C. phaseoli, and Zabrotes subfasciatus. 1) V. sublobata race II TC1966 was resistant to all weevil species except to C. analis. V. radiata B1F3, which contained a resistance gene from V. sublobata TC1966 showed the same resistance as TC1966 itself. 2) Black gram, V. mungo, was resistant only to C. phaseoli and C. chinensis. C. maculatus, C. analis, and Z. subfasciatus could successfully emerge as adults from V. mungo, although their developments were substantially slower than in commercial V. radiata. 3) V. sublobata race I (Plu-416), a wild relative of V. mungo, showed complete resistance against all weevil species examined in this study. The presence of two resistance factors A and B in the beans used in the present study is hypothesized : Factor A (effective against C. chinensis, C. phaseoli, C. maculatus, and Z. subfasciatus) is present in V. sublobata race II TC1966, while factor B (effective against C. chinensis and C. phaseoli, and partially effective against C. maculatus, Z. subfasciatus, and C. analis) is present in V. mungo. Both factors are present in V. sublobata race I.
