WL 442
1 WL 442 is a 167-plant synthetic variety resulting from phenotypic recurrent selection for resistance to Verticillium wilt. Source material traces to two elite experimental lines selected for resistance to Phytophthora root rot. Parental germplasm traces to WL 457, WL 512, WL 450 and WL 504. Approximate germplasm source contributions are: Ladak (6%), M. varia (7%), Turkistan (11%), Flemish (9%), Chilean (30%), Peruvian (29%), Indian (5%), and African (3%).
2. WL 442 is adapted to and intended for use in the Southwestern United States. WL 442 has been yield tested in California.
3. Flower color of WL 442 at syn2 approximates 100% purple with traces of cream, variegated and white. The fall dormancy of WL 442 is similar to ABI 700 (Group 6).
4. WL 442 has high resistance to anthracnose (race 1), Fusariurn wilt, Verticillium wilt, Phytophthora root rot, stem nematode, blue alfalfa aphid, pea aphid and spotted alfalfa aphid; and resistance to bacterial wilt and southern root-knot nematode. Reaction to Aphanomyces root rot (race 1) has not been adequately tested.
5. Breeder seed (syn1) was produced in 1994 on 167 plants under cage isolation at Warden, Washington. Sufficient foundation seed for the expected life of the variety will be maintained by W-L Research. One generation of breeder (syn1) and two generations each of foundation (syn2 or 3) and certified (syn3 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 1998.
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. Variety Name: WL 442
Experimental Designation: W138
Date first accepted: January 1998
Date this amendment submitted: November 1999