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.