1. DK189 is a synthetic variety which was developed by strain crossing followed by phenotypic recurrent selection for resistance to Verticillium wilt. Parentage traces to VS-448, Pierce, AS-13R, and VS-446. Estimates of the major germplasm sources that constitute this variety are: M. falcata (1%), Ladak (1%), M. varia (3%), Turkistan (17%), Flemish (1%), Chilean (7%), Peruvian (12%), Indian (20%), African (35%), and unknown (3%).

2. DK189 is intended f