1. C/W 2820 is a synthetic variety with 175 parent plants which were selected from populations that were developed by phenotypic recurrent selection and strain crossing. Parent plants were selected for multifoliolate expression and for resistance to one or more of the following pests: anthracnose, Phytophthora root rot, Verticillium wilt, spotted alfalfa aphid, and Stagnospora root and crown rot. The following germplasm sources were used in the development of C/W 2820: Condor, Pierce, VS--446, Express, Arizona Multileaf (AZMFA), WL 504, Valley +, GT13R+, WL 605, Sundor, Mede, Madera, VS-448, Maricopa, and Yolo. Approximate germplasm source contributions are as follows: Ladak (1%), M.varia (7%), Turkistan (14%), Flemish (7%), Chilean (10%), Peruvian (1%), Indian (28%), African (30%), and Unknown (2%).
2. C/W 2820 is adapted to the
Sacramento Valley and San Joaquin Valley of California and is intended
for use in the Sacramento and San Joaquin Valleys of California and similar
production areas of Nevada, Arizona, and New Mexico. C/W 2820 has been
tested in
California.
3. C/W 2820 is a nondormant variety with fall dormancy similar to Moapa 69. Flower color observed in the Syn. 1 generation is approximately 98% purple, 2% variegated, and a trace of white, cream, and yellow.
4. C/W 2820 has high resistance to spotted alfalfa aphid with resistance to Fusarium wilt, anthracnose (race 1), and pea aphid. It has moderate resistance to Verticillium wilt and Phytophthora root rot and low resistance to bacterial wilt and stem nematode. Reaction to blue alfalfa aphid, root knot nematode, and Aphanomyces root rot 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 1990. 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 2820 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.