1. NAPB 21 is a 251-clone synthetic variety. Parental clones were selected following 3 or 4 cycles of field selection for resistance to Verticillium wilt, from populations which had previously been selected for winter survival plus resistance to Phytophthora root rot, anthracnose, baceterial wilt and Fusarium wilt. Parentage traces predominately (in Order of contribution) to Endure, Apollo II, Saranac AR, Atlas, Olympic, Apollo, WL-318, and Anchor.
2. NAPB 21 is intended for use in the northern region of the U.S. as hay, haylage, greenchop or dehy production. It has been tested in Iowa, Wisconsin, Michigan, Pennsylvania, and Idaho.
3. Fall dormancy is between Ranger and Vernal. Flower color of foundation generation is approximately 71% purple and 29% variegated.
4. NAPB 21 has high resistance to bacterial wilt and Fusarium wilt, resistance to Phytophthora root rot and Verticillium wilt and moderate resistance to anthracnose and potato leafhopper yellowing. Reaction to pea aphid, spotted alfalfa aphid and stem nematode has not been adequately tested.
5. Breeder (Syn 1) seed was produced on cuttings at Nampa, Idaho, bulked over two years and is held in cold storage. Seed increase is limited to one generation each of breeder, foundation, and certified classes. Certified seed may be produced from either breeder or foundation seed. A 3 and 6 year stand life is permitted on fields producing foundation and certified seed respectively. Foundation seed production is limited to the northern regions of adaptation.
6. Certified seed will be available in 1986.
7. No decision has been made on Plant Variety Protection.