1. DK-189 is a synthetic variety which was developed by strain crossing followed by phenotypic recurrent selection for Verticillium wilt resistance. Parentage traces to VS--448, Pierce, AS-13R, and VS-446. Estimates of the major gerinpiasm 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. DK-189 is intended for use in the Sacramento and San Joaquin Valleys of California and similar production areas of Nevada, Arizona, and New Mexico for hay, haylage, or dehy production. DK-189 has been tested in California.
3. DK-189 is a nondormant variety with fall dormancy similar to Moapa 69. Flower color is approximately 98% purple, 2% variegated, and a trace of cream or yellow.
4. DK-189 has high resistance to anthracnose, Fusarium wilt, and spotted alfalfa aphid; resistance to Phytophthora root rot, blue alfalfa aphid, and pea aphid; and moderate resistance to Verticillium wilt, bacterial wilt, and stem nematode.
5. Seed increase of DK-189 is on a limited-generation basis with one generation each of breeder and certified seed classes, and up to two generations of foundation seed. Breeder seed (Syn 1), foundation seed (Syn 2 or Syn 3), and certified seed (Syn 3 or Syn 4) classes will be recognized. Breeder seed (Syn 1) was produced under cage isolation near Woodland, CA in 1987. Sufficient foundation seed for the projected life of this variety will be maintained by Vista. Production of Syn 3 foundation seed requires consent of the breeder. Stands of foundation and certified seed fields are limited to 3 and 6 years, respectively.
6. Certified seed of DK--189 will be available in 1990.
7. No decision has been made regarding Plant Variety Protection (PVP).
8. This information can be
forwarded to the PVP office.