CW 64010
1. CW640 10 is a synthetic variety with 250 parent plants which were selected sequentially for multifoliolate leaf expression and for resistance to Phytophthora root rot and Aphanomyces root rot (race 1). Parent plants were selected from crosses between selections from three yearold Wisconsin, Iowa, and Minnesota yield trials. Source varieties were derived from various populations which were developed by phenotypic recurrent selection for high relative feed value (using Near Infrared Reflectance Spectroscopy), and for resistance to one or more of the following pests: bacterial wilt, Verticillium wilt, Phytophthora root rot, Aphanomyces root rot (race 1), anthracnose (race 1), and Leptosphaerulina leafspot. Parentage of CW 64010 ft-aces to the following germplasm sources: BigHorn, Hunter, Maximum 1, and miscellaneous Cal/West Seeds breeding populations. Approximate germplasm source contributions are as follows: M.falcata (8%), Ladak (5%), M varia (26%), Turkistan (4%), Flemish (480/6), and Chilean (9%).
2. CW 640 10 is adapted to and intended for use in the north central, east central, and Great Plains areas of the U.S. CW 64010 has been tested in Wisconsin, Minnesota, Iowa, Michigan, Pennsylvania, and Nebraska.
3. CW 64010 is a moderately dormant variety with fall dormancy similar to FD class 4 check varieties. Flower color observed in the syn2 generation is approximately 99% purple, 1% variegated, with a trace of white, cream, and yellow.
4. CW 64010 has high resistance to anthracnose (race 1), bacterial wilt, Fusarium, wilt, Verticillium wilt, Phytophthora root rot, and stem nematode with resistance to Aphanomyces root rot (race 1), spotted alfalfa aphid, and pea aphid. Reaction to blue alfalfa aphid and root knot nematode has not been adequately tested.
5. Seed increase of CW 64010 is on a limited generation basis with one generation of breeder and two generations of the foundation and certified seed classes. Breeder (syn1), foundation 00 (syn2 or 3), and certified (syn3 or 4) classes will be recognized. Production of syn3 foundation seed requires consent of the breeder. Breeder seed was produced under cage isolation near Woodland, California, in 1996. Sufficient foundation seed for the projected life of the variety will be maintained by Cal/West Seeds. Stands of foundation and certified as seed fields are limited to three and six years, respectively.
6. Certified seed of CW 64010 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 64010