Relative susceptibilities to Sphaeropsis sapinea of six Pinus spp. cultivated in South Africa

Abstract The relative susceptibilities to Sphaeropsis sapinea of six Pinus spp. cultivated in South Africa were investigated in growth chamber and field inoculations. The relative susceptibilities of the species tested, compare favourably with field observations by foresters over a number of years. There was some variation in pathogenicity among S. sapinea isolates on the different species.