Yield stability, with or without single,stacked, or partial resistance, also may be effective in reducing potential yield losses. Cultivars that show some level of yield
stability will be identified. Dealing with yield stability in a breeding program may not be an easy task, since this will require that later generation material be evaluated by comparing yields of plants in plots with rust to plants in plots sprayed with a fungicide to control rust so that percentages of yield among lines based on the control
plots can be compared. Each season in the United States without rust provides additional
time to evaluate and register fungicides,
and test and incorporate resistance
and/or yield stability into more adaptable
soybean breeding lines.