Yield stability indices of primocane-fruiting red raspberry (Rubus idaeus L.)

Three primocane-fruiting cultivars were grown over 14 location/years (envir onments) to assess their relative yield stability using three different sta tistical models. The models varied in their definition of stability and som etimes produced conflicting results. In general, ranking of the three culti vars from most to least stable was Heritage, Redwing and Autumn Bliss. Alth ough Redwing and Autumn Bliss had better productivity than Heritage, both c ultivars had a large portion of genotype x environment variance attributed to unpredictable elements according to some stability analyses. This variat ion was characterized by large and significant deviations from linearity. N o single model adequately characterized stability in these cultivars. The t hree cultivars varied in productivity across the 14 environments, with Heri tage always yielding less than the two other cultivars.