VS-533
(Experimental Desig.)
1. VS-533 is a synthetic variety with 300 parent plants. Parent plants trace to a population selected for multifoliolate expression and resistance to one or more of the following pests: bacterial wilt, Verticillium wilt, anthracnose, Phytophthora root rot, Leptosphaerulina leafspot and spotted alfalfa aphid. Phenotypic recurrent selection was used. Parentage traces predominately (in order of contribution) to Legend, Crown, G-2852, and Edge. Approximate germplasm source contributions are: M. falcata - 4%, Ladak - 5%, M. varia - 24%, Turkistan - 3%, Flemish - 59%, and Chilean - 5%.
2. VS-533 is intended for use in the north central and northeastern U.S. for hay, haylage, greenchop or dehy production. It has been tested in Wisconsin, Minnesota, and Pennsylvania.
3. VS-533 is a dormant variety with fall dormancy similar to Ranger. Flower color is 70% purple and 30% variegated, with a trace of white, yellow and cream. At first flower 40% to 68% of the plants show some multifoliolate expression, depending on environment.
4. VS-533 has high resistance to bacterial wilt, anthracnose, Phytophthora root rot and Fusarium wilt, with resistance to Verticillium wilt, and pea aphid. It has moderate resistance to spotted alfalfa aphid. VS-533 has significant resistance to Leptosphaerulina leafspot but actual percentage resistant plants has not been determined. Reaction to stem nematode and blue alfalfa aphid has not been adequately tested.
5. Seed increase is on a limited generation basis with one generation each of breeder and certified seed classes, and two generations of foundation seed. Breeder (Syn. 1), foundation (Syn. 2 or Syn. 3), and certified (Syn. 3 or Syn. 4) classes will be recognized. Production of Syn. 3 foundation seed requires the consent of the breeder. Breeder seed was produced under cage isolation at Woodland, CA. Sufficient foundation seed for the projected life of the variety will be maintained by VISTA. Stands of foundation and certified seed fields are limited to 3 and six years, respectively.
6. Certified seed will be marketed in 1990.
7. No decision has been made concerning Plant Variety Protection.
8. This information can be forwarded to the PVP office.