UltraLac
1. UltraLac is a synthetic variety with 170 parent plants which were selectedsequentially formultifoliolate leaf expression and for resistance to Phytophthoraroot rot and Aphanomyces root rot (race 1). Parent plants were selected fromcrosses between selections from three year oldWisconsin clonal and selection.Nursery selections were made from various populations whichwere developedby phenotypic recurrent selection for high relative feed value (using NearInfrared Reflectance Spectroscopy), and for resistance to one or more ofthe following pests:bacterial wilt Verticillium wilt, Phytophthora root rot,Aphanomyces root rot (race 1),anthracnose (race 1), and Leptosphaerulinaleafspot. Parentage of UltraLac traces to thefollowing germplasm sourcesGH 767, MultiQueen, 2888, 329, Alfaleaf 11, and miscellaneousCal/West Seedsbreeding populations. Approximate germplasm. source contributions are asfollows:M. fiaicata (9%), Ladak (7%), M. varia (25%), Turkistan(5%), Flemish (45%), andChilean (9%).
2. UltraLac is adapted to the north central area of the U.S. and is intendedfor use in the northcentral and east central areas of the U.S. UltraLac hasbeen tested in Wisconsin, Minnesota, andIowa.
3. UltraLac is a dormant variety with fall dormancy similar to Vernal.Flower color observed inthe syn2 generation is approximately 90% purple,9% variegated, 1% yellow with a trace ofcream and white.
4. UltraLac has high resistance to anthracnose (race 1), bacterial wilt,Fusarium wilt,Verticillium. wilt, Phytophthora root rot, Aphanomyces rootrot (race 1), and spotted alfalfaaphid, and resistance to stem nematode.Reaction to pea aphid, blue alfalfa aphid, and root knotnematode has notbeen adequately tested.
5. Seed increase of UtraLac is on a limited generation basis with onegeneration of breeder andtwo generations of the foundation and certifiedseed classes. Breeder (syn1), foundation (syn 2or 3), and certified (syn3or 4) classes will be recognized. Production of syn3 foundation seedrequiresconsent of the breeder. Breeder seed was produced under cage isolation nearWoodland,California, in 1994. Sufficient foundation seed for the projectedlife of the variety will bemaintained by Cal/West Seeds.Stands of foundation and certified seed fields are limited to threeand sixyears, respectively.
6. Certified seed of UltraLac will be available in 1999.
7. No decision has been made regarding Plant Variety Protection.
8. This information can be forwarded to the PVP office.
9. Variety name: UltraLac
Experimental designation: CW 4223
Date first accepted this variety: January 1999
Date this amendment submitted: November 30, 1999