The use of breeding trials to estimate disease-induced yield losses and to refine selection strategies
Data are routinely available on Pachymetra root rot resistance in northern clones. In this study, resistance to other diseases (yellow spot and orange rust) was also assessed in stage 3 breeding trials in the northern program. Analyses were conducted relating yielding ability of clones in stage 3 (FAT) trials to disease resistance. The results suggested that yellow spot, Pachymetra root rot and orange rust were each influencing the yield of clones in northern breeding trials. Yield loss estimates were calculated as well as the relationship between resistance and yield.