1. Allegro is a synthetic variety with 71 parent clones. Parent clones trace to 19 populations selected for resistance to the following pests: bacterial wilt, Fusarium wilt, Verticillium wilt, Phytophthora root rot, anthracnose and Aphanomyces. Phenotypic recurrent selection was used. Final selections were made from 2-year-old space-plant selection nursenes at Marsbfleld and Livingston, Wisconsin, based on vigor, leafhopper yellowing resistance, leaf disease resistance, winter injuty and fall dormancy reaction. Parentage traces to Exp A.P 8734 (17%), Venture (15%), Genesis (14%), Garst 645 (100/o), Aggressor (8%), Nordic (7%), Cutter (7%), Stine 9227 (6%), Exp AP 8832, Exp AP 8822 and Dominator (4% each), Trident II (3%) and Exp AP 863 SB (1%). Approximate germplasm source contributions are: M falcata (8%), Ladak (8%), M. varia (2 1%), Turkistan (16%), Flemish (30%), Chilean (8%), Peruvian (4%) and 5% unknown.
2. Allegro appears to be adapted to and is intended for use in the North Central U.S. It has been tested in Wisconsin, Iowa and Idaho.
3. Fall dormancy of Allegro is similar to Saranac. Flower color of Syn 2 is approximately 74% purple and 26% variegated, with a trace of cream, white and yellow.
4. Allegro has high resistance to bacterial wilt, Fusarium wilt, anthracnose (race 1), Phytophthora root rot and pea aphid; resistance to Vertidillium wilt and Aphanomyces (race 1); and moderate resistance to spotted alfalfa aphid and stem nematode. Reaction to blue alfalfa aphid and root knot nematode has not been determined.
5. Seed increase is limited to one generation each of breeder (Syn 1), foundation (Syn 2) and certified (Syn 3) seed classes. Certified seed may be produced from either breeder or foundation classes. A 1, 3 and 6-year stand life is permitted on fields producing breeder, foundation and certified classes respectively. Foundation seed production is limited to the Pacific Northwest. Breeder seed was produced in 1990. ABI will maintain sufficient seed stocks for the projected life of the variety.
6. Certified seed will be available in 1993.
7. Plant Variety Protection will not be applied for.
8. This information can be forwarded to the PVP office.