Inheritance of resistance toFusarium spp. in tuber progenies of potato

Summary Glasshouse-grown seedling tubers of 22 progenies from parents differing in resistance toFusarium coeruleum andF. sulphureum (Gibberella cyanogena) were wound-inoculated with a cornmeal + sand culture of one or other of these dry rot pathogens. WithF. coeruleum, differences between progenies were due entirely to differences in the general combining abilities (gca) of the parents. Parental and gca values were highly correlated, as were the mean resistance of a progeny and that of its parents. WithG. cyanogena the agreement between replicates was poor and differences between progenies were less clear. It is suggested that different resistance mechanisms operate against these two pathogens.