Genetics of field resistance to Melampsora in Salix viminalis.

The article analyzes the inheritance of resistance to Melampsora on Salix viminalis, the variation in resistance over space and time, and rust infection rate in relation to the geographic origin of the host. Four series of experiments located in south-central and southernmost Sweden were used for the analysis. The analysis showed that there was considerable additive genetic variation for rust resistance, that the results have low repeatability over space and time, and that the material from southernmost Sweden was most sensitive to the rusts occurring in South Sweden.