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633 1. 633 is a synthetic variety with 300 parent plants. Parent plants trace to populations selected for resistance to Aphanomyces root rot and one or more of the following pests: bacterial wilt, Verticillium wilt, Phytophthora root rot, anthracnose, Leptosphaerulina leaf spot and spotted alfalfa aphid. Phenotypic recurrent selection was used. The following germplasm sources were used in the development of 633: Edge, Apollo II, Crown, Verta +, Endure, G--2852 and DK--125. Approximate germplasm source contributions are as follows: M. falcata --6%, Ladak --5%, M. varia --25%, Turkistan --5%, Flemish --57%, and Chilean --2%. 2. 633 is adapted to and intended for use in the central, northeastern,
northwestern and southeastern U.S. for hay, haylage,
3. 633 is a moderately dormant variety. Fall dormancy is similar to Saranac. Flower color is 70% purple, 30% variegated, and a trace of white, yellow and cream. 4. 633 has high resistance to anthracnose (race 1), bacterial wilt, Phytophthora root rot and spotted alfalfa aphid with resistance to Fusarium wilt, Verticillium wilt, and pea aphid. It has moderate resistance to Aphanomyces root rot (race 1 ) and stem nematode. Reaction to blue alfalfa aphid has not been adequately tested. 5. Seed increase is on a limited generation basis with one generation of breeder and two generations of the foundation and certified seed classes. 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 6 years, respectively. 6. Certified seed will be marketed in 1991. 7. No decision has been made concerning Plant Variety Protection. 8. This information can be forwarded to the PVP office.
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