1. C/W 2589 is a synthetic variety with 221 parent plants which were selected from populations that were developed by phenotypic recurrent selection and strain crossing. Parent plants were selected for resistance to one or more of the following pests: anthracnose, Verticillium wilt, Phytophthora root rot, and spotted alfalfa aphid. The following germplasm sources were used in the development of C/W 2589: Mede, Valley +, Diamond, VS--481, VS--448, Sapphire, Baron, and PI346919 (M. glutinosa). Approximate germplasm source contributions are as follows: M. falcata (3%), Ladak (4%), M.varia (12%), Turkistan (12%), Flemish (30%), Chilean (10%), Peruvian (3%), Indian (6%), African (12%), and Unknown (8%).
2. C/W 2589 is adapted to and intended for use in the Sacramento Valley, Intermountain Valleys of the Western U.S., Southeastern U.S., and the southern transition zone. C/W 2589 has been tested in California, New Mexico, and Virginia.
3. C/W 2589 is a moderately dormant variety with fall dormancy similar to Lahonton. Flower color observed in the Syn. 1 generation is approximately 99% purple, 1% variegated, and a trace of white, cream, and yellow.
4. C/W 2589 has high resistance to anthracnose (race 1), Phytophthora root rot, and spotted alfalfa aphid with resistance to Verticillium wilt, pea aphid, and blue alfalfa aphid. It has moderate resistance to bacterial wilt. Reaction to stem nematode, root knot nematode, Aphanomyces root rot, and Fusarium wilt has not been adequately tested.
5. Seed increase is on a limited generation basis with one generation of breeder and two generations of the foundation and certified seed classes. Breeder (Syn. 1), foundation (Syn. 2 or Syn. 3), and certified (Syn. 3 or Syn. 4) classes will be recognized. Production of Syn. 3 foundation seed requires the consent of the breeder. Breeder seed was produced under cage isolation at Woodland, CA in 1988. Sufficient foundation seed for the projected life of the variety will be maintained by Cal/West Seeds. Stands of foundation and certified seed fields are limited to 3 and 6 years, respectively.
6. Certified seed of C/W 2589 will be available in 1993.
7. No decision has been made concerning Plant Variety Protection.
8. This information can be forwarded
to the PVP office.