XAM73
(Experimental Desig.)
1. XAM73 is a 221 plant synthetic cultivar with parents selected through phenotypic recurrent selection originating from several experimental lines tracing to 5432, 532, NCMP10, Atra 55, DKl2O, Culver, Narragansett, Iroquois, Team, Cherokee, Arnim, Vernal, MSB-W4, Dawson, 520, WL305 and WL202. Parent plants were selected for one or more of the following: bacterial wilt, Verticillium wilt, and anthracnose. Germplasm sources are: M. falcata (6%), Ladak (9%), M. varia (28%), Turkistan (5%), Flemish (45%), and Chilean (7%).
2. XAM73 is a winterhardy cultivar adapted to the central and northern regions of the United States for hay, haylage, greenchop, and dehydration. The states in which XAM73 have been tested are: Iowa, Minnesota, Indiana, New York, Pennsylvania, Maryland, Oregon, Washington, Illinois, and Wisconsin. The variety has been tested using the following experimental designations: XAM73, YAM73 and 85SV811.
3. Flower color in the Syn 2 generation is approximately 94% purple and 6% variegated with a trace of yellow, white and cream. Growth habit is erect in midsummer and semi-erect in the fall. Its dormancy is similar to the variety Saranac.
4. XAM73 has high resistance to anthracnose (Race 1), bacterial wilt, Fusarium wilt, and pea aphid; resistance to Verticillium wilt and spotted alfalfa aphid; moderate resistance to anthracnose (Race 2) and Phytophthora root rot; low resistance to Aphanomyces. Resistance to blue alfalfa aphid and stem nematode has not been adequately determined.
5. Breeder seed (Syn 1) was produced over a two year period on parent plants in "cage isolation" and bulked. Seed classes will be breeder, foundation and certified. Foundation seed may be produced from breeder or foundation. The second generation foundation may be produced at the discretion of Pioneer Hi-Bred International, Inc. Limitation on ages of stand will be three and five years, respectively, for foundation and certified seed.
6. Seed will be marketed in the spring of 1990.
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 Application for Review of Alfalfa Variety for Certification may be provided to the PVP office.