58N57

1. 58N57 is a synthetic variety of 180 parental plants tracing to two lines. Ninety (90) parental plants were selected through phenotypic selection for resistance to anthracnose (race 1) and stem nematodes using sequential inoculation from a Pioneer experimental. Ninety (90) parental plants from another Pioneer experimental were selected through phenotypic selection for resistance to anthracnose. 58N57 traces to CUFlOl (23%), Pierce (11%), 5715 (11%), GT13R+ (8%), 572 (6%), WIASO (6%), A513R (5%), Matador (3%), WL3 18 (2%), WL512 (1%) with 24% contributions from Anchor, Citation, Vernal, Titan, Weevlcheck, Nugget, Temp, Kanza, Aphidor. Germplasm sources are approximately: Medicago falcata (0. 5%), Ladak (0. 5%), M. varia (4. 2%), Turkistan (52%), Flemish (0. 5%), Chilean (3%), Peruvian (0. 1%), Indian (10. 4%), African (35. 1%) and unknown (40. 5%).

2. 58N57 is intended for use in the southwestern part of the U. S. and other areas of the world where nondormant alfalfa are grown. It has been tested for yield in California, Argentina, Australia, Spain and Italy and is intended to be used in these areas.

3. 58N57 is a nondormant cultivar with a fall dormancy similar to Moapa 69. Flower color of the Syn 2 generation is 96% purple, 4% variegated with traces of cream, yellow and white.

4. 58N57 has high resistance to anthracnose (race 1), Phytophthora root rot, pea aphid, blue aphid, northern root knot nematode, southern root knot nematode; resistance to Fusarium wilt and spotted alfalfa aphid; moderate resistance to stem nematode; low resistance to bacterial wilt and Verticillium wilt; susceptible to Aphanomyces root rot

5. Breeders seed (Syn 1) was produced in 1993 on parent plants in "cage isolation" and bulked. Seed classes will be breeder, foundation (Syn 2 or Syn 3) and certified (Syn 2, Syn 3, or Syn 4). Foundation seed may be produced from breeder or foundation. The second generation foundation (Syn 3) may be produced at the discretion of Pioneer Hi-Bred International, Inc. Limitations on age of stand will be two years, three years and five years, respectively, for breeder seed, foundation seed and certified seed. Breeder seed must be produced in California Sufficient breeder and/or foundation seed for the projected life of the variety will be maintained by Pioneer Hi-Bred International, Inc.

6. Certified seed will be marketed in the fall of 1998 in the U. S.

7. Application for Plant Variety Protection will be made, and the certification option will not be requested.

8. As a means of added varietal protection, information included with the application for Review of Alfalfa Varieties for Certification may be provided to the PVP office.

9. Variety name: 58N57 Date submitted: November 26, 1997.

Experimental designations: X58N57, YAN57