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Seven crosses out of which six crosses involving resistant × susceptible parents and one cross involving both resistant parents were studied. In the crosses involving CR 57-MR-1523, as a resistant parent, 2 to 3 dominant complementary genes governed resistance. The genetical analysis of the cross, PTB21 × Leb Muey Nahng, suggested presence of dominant inhibitory gene in the susceptible parent Leb Muey Nahng. In the crosses, Sona × RP 9–4 and T(N)1 × RP 9–4, the resistance was governed by a single dominant gene. In one cross (RPW 6–17 × Umsum), the resistance was governed by two duplicate recessive genes. The genes governing resistance in CR 57-MR-1523 and CR 94-MR-1550 were identical.
