Inheritance of resistance to B. cinerea was studied in a half diallel cross involving resistant parents derived from Chief red raspberry and a 3rd backcross hybrid of R. occidentalis [black raspberry] and in backcrosses to raspberry of R. pileatus and R. coreanus hybrids. Resistance in the diallel were inherited additively, with no interactions. The levels of resistance in the backcrosses were much higher than in the diallel, indicating good prospects for obtaining highly resistant cultivars. The resistance to the 2 pathogens were highly correlated in progenies derived from each resistance source and, with the possible exception of resistance derived from R. coreanus, there was no evidence that resistance to 1 disease segregated independently of that to the other.