1. W320 is a 163-plant synthetic variety resulting from a cross between two elite experimental lines. Source material traces to WL 320, WL 457, WL 512, WL 450, and WL 451. Approximate germplasm source contributions are Arabian (24%), African (30%), Indian (10%), Chilean (16%), Turkistan (8%), Flemish (6%), Ladak (30/6), and M. varia (3%).
2. W320 is adapted to and intended for use in the southwestern United States. W320 has been tested in California.
3. Flower color of W320 at syn2 approximates 100% purple with a trace of variegated. The fall dormancy of W320 is similar to Pierce (Class 8).
4. W320 has high resistance to Fusarium. wilt, Verticillium wilt, Phytophthora root rot, and spotted alfalfa aphid; and resistance to stem nematode and southern root knot nematode. Reaction to anthracnose (race 1), bacterial wilt, blue alfalfa aphid, pea aphid, northern root knot nematode, and Aphanomyces root rot (race 1) has not been adequately tested.
5. Breeder seed (syn1) was produced in 1996 on 163 plants under cage isolation at Warden, Washington. Sufficient foundation (syn2) seed will be produced for the expected life of the variety and will be maintained by W-L Research. One generation of breeder (syn1), two generations of foundation (syn2 or 3) and three generations of certified (syn2, 3 or 4) seed are recognized. The maximum permitted length of stand for foundation and certified seed fields are three and five years, respectively. Production of syn3 foundation seed requires consent of the breeder.
6. Certified seed will be marketed in 2000.
7. It is undecided whether application will be made for Plant Variety Protection.
8. The information in this application can be turned over to the PVP office.
9. Experimental designation: W320
Date submitted: November 1999