CW 64008
1. CW64008 is a synthetic variety with 225 parent plants which wereselectedsequentially formultifoliolate leaf expression and for resistanceto Phytophthoraroot rot and Aphanomyces rootrot (race 1). Parent plants wereselected fromcrosses between selections from three year oldWisconsin, Minnesota,and Iowayield tests and selections from three year old Wisconsinnurseries.Nurseryselections were made from various populations which were developedbyphenotypicrecurrent selection for high relative feed value (using NearInfrared ReflectanceSpectroscopy), and for resistance to one or more of thefollowing pests:bacterial wilt,verticillium wilt, Phytophthora root rot,Aphanomyces rootrot (race 1), anthracnose (race 1),and Leptosphaerulina leafspot.Parentageof CW 64008 traces to the following germplasm.sources: WinterKing,Maximum1, 9326, BigHorn, Hunter, and miscellaneous Cal/West Seedsbreedingpopulations.Approximate germplasm source contributions are as Follows: M.falcata(8%),Ladak (5%), M. varia (26%), Turkistan (4%), Flemish (48%), andChilean (9%).
2. CW 64008 is adapted to the north central area of the U.S. and is intendedfor use in the northcentral, east central, and Great Plains areas of theU.S.CW 64008 has been tested in Wisconsin,Minnesota, and Iowa.
3. CW 64008 is a moderately dormant variety with fall dormancy similarto Fl) class 4 checkvarieties. Flower color observed in the syn2 generationis approximately 99% purple, 1%variegated, with a trace of white, cream,andyellow.
4. CW 64008 has high resistance to anthracnose (race 1), bacterial wilt,Fusarium wilt,Verticillium wilt, Phytophthora root rot, and Aphanomyces rootrot (race 1), with resistance tospotted alfalfa aphid, pea aphid, and stemnematode. Reaction to blue alfalfa aphid and root knotnematode has not beenadequately tested.
5. Seed increase of CW 64008 is on a limited generation basis with onegeneration of breederand two generations of the foundation and certifiedseedclasses. Breeder (syn1), foundation(syn2 or 3), and certified (syn3or 4)classes will be recognized. Production of syn3 foundationseed requiresconsentof the breeder Breeder seed was produced under cageisolationnearWoodland, California, in 1996. Sufficient foundation seed forthe projectedlife of the varietywill be maintained by Cal/West Seeds. Standsof foundationand certified seed fields are limitedto three and six years,respectively.
6. Certified seed of CW 64008 will be available in 1999.
7. No decision has been made regarding Plant Variety Protection.
8. This information can be forwarded to the PVP office.
9. Date submitted: November 30, 1999
Experimental designation: CW 64008