1. C/W 2690 is a synthetic variety with 285 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, Phytophthora root rot, Verticillium wilt, and blue alfalfa aphid. The following germplasm sources were used in the development of C/W 2690: Mede, Sundor, Maricopa, Madera, and Condor. Approximate germplasm source contributions are as follows: M.falcata (2%),Ladak (2%), M.varia (8%), Turkistan (14%), Flemish (22%), Chilean (11%), Peruvian (1%), Indian (13%), African (20%), and Unknown (7%).
2. C/W 2690 is adapted to the
Sacramento Valley of California and Mesilla Valley of New Mexico and is
intended for use in the Sacramento Valley and similar high desert valleys
of California, Nevada, Idaho, Arizona, and New Mexico. C/W 2690 has been
tested in
California and New Mexico.
3. C/W 2690 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 2690 has high resistance to anthracnose (race 1) and pea aphid, with resistance to Phytophthora root rot, spotted alfalfa aphid, and blue alfalfa aphid. It has moderate resistance to Verticillium wilt and 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 2690 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.