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CW 99052 |
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1. CW 99052 is a synthetic variety with 180 parent plants that were selected for resistance to stem nematode, anthracnose (race 1), and Phytophthora root rot. Parent plants were selected from crosses between selections from four-year old California yield trials and selections from seed yield nurseries. Source populations from yield trials and nurseries were developed by a combination of phenotypic recurrent selection and strain crossing with selection for resistance to one or more of the following pests: Fusarium wilt, Verticillium wilt, Phytophthora root rot, anthracnose (race 1), spotted alfalfa aphid, and blue alfalfa aphid. Parentage of CW 99052 traces to Robusta, CW 907, ACA 900, DK 191, Grasis, Grasis II, 5929, DK 192, and miscellaneous Cal/West Seeds breeding populations. Approximate germplasm source contributions are as follows: M.varia (2%), Turkistan (8%), Flemish (1%), Chilean (6%), Peruvian (3%), Indian (26%), African (54%). 2. CW 99052 is adapted to and intended for use in the Southwest area of the U.S., Mexico, and Argentina. CW 99052 has been tested in California, Mexico, and Argentina. 3. CW 99052 is a very nondormant variety with fall dormancy similar to FD class 10 check varieties. Flower color observed in the Syn.2 generation is approximately 100% purple with a trace of variegated, white, cream, and yellow. 4. CW 99052 has high resistance to Fusarium wilt, Phytophthora root rot, stem nematode, and spotted alfalfa aphid, with resistance to anthracnose (race 1), Verticillium wilt, and blue alfalfa aphid, and moderate resistance to bacterial wilt. Reaction to Aphanomyces root rot (race 1), pea aphid, and northern root knot nematode (Meloidogyne hapla) has not been adequately tested. 5. Seed increase of CW 99052 is on a limited generation basis with one generation of breeder and two generations of the foundation and certified seed classes. Breeder (Syn.l), foundation (Syn.2 or Syn.3), and certified (Syn.3 or Syn.4) clas |