1. Arriba is a synthetic variety with 250 parent clones. Parent clones trace to two populations selected for resistance to verticillium wilt, anthracnose (Race 1), spotted alfalfa aphid, blue alfalfa aphid, pea aphid, and stem nematode. Phenotypic recurrent selection was used. Final selections were made from a space planted nursery near Nampa, Idaho. Parentage traces to Lobo (80%) and ABI 700 (20%). Approximate germplasm source contributions are: M. falcata (6%), Ladak (6%), M. varia (19%), Turkistan (13%), Flemish (30%), Chilean ( 9%), Peruvian (2%), Indian (2%), African (1%), and unknown (12%). Breeder seed (Syn 1) was produced under field isolation near Nampa, Idaho in 1991.
2. Arriba is adapted to the moderately Winterhardy Intermountain region of the United States. It is intended for use in areas of the Northwest San Joaquin Valley of California, to the Sacramento valley and Coastal Valleys, of Southern California and intermediate and high desert valleys of Southern California, Arizona, Nevada and lower elevations of Idaho, Utah Oregon and Washington. Arriba has been tested in California and Idaho.
3. Fall dormancy is similar to Mesilla. Flower color is approximately 90% purple and 9% variegated with less than 1% cream, yellow and white.
4. Arriba has high resistance to Anthracnose (Race 1), Phytophthora root rot, Fusarium wilt, pea aphid, spotted alfalfa aphid, and blue alfalfa aphid, Stem nematode and southern root knot nematode; resistance to bacterial wilt, and Verticillium wilt, moderate resistance to northern root knot nematode, and aphanomyces root rot (Race 1).
5. Seed increase is limited to one generation each of breeder (Syn 1), two generations of foundation and two to three generations of 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 1991. ABI will maintain sufficient stocks for the projected life of the variety.
6. Certified seed will be available in 1997
7. Plant variety protection will not be applied for.
8. This information can be forwarded to the PVP office.
9. Variety Name: Arriba Date submitted November 27. 2002
Experimental designations: ABI 9161, AP 9161