1. DK166 is a synthetic variety with 184 parent plants which were selected from populations that were developed by phenotypic recurrent selection and strain crossing. Parent plants were selected for multifoliolate expression and for resistance to one or more of the following pests: anthracnose (race 1), Verticillium wilt, Phytopthora root rot, blue alfalfa aphid, and spotted alfalfa aphid. The following germplasm sources were used in the development of DK166: Express, Condor, Valley +, VS-626, Shenandoah, VS-481, and Mede. Approximate germplasm source contributions are as follows: M. falcata (1%), Ladak (2%), M. varia ( 8%), Turkistan (12%), Flemish (30%), Chilean (11%), Peruvian (1%), Indian (10%), African (19%), and unknown (6%).
2. DK166 is adapted to the Sacramento Valley and San Joaquin Valley of California, the Mesilla Valley and San Juan Valley of New Mexico, and to Idaho, and is intended for use in the Sacramento Valley and similar high desert valleys of California, Nevada, Idaho, Arizona, and New Mexico. DK166 has been tested in California, Idaho, and New Mexico.
3. DK166 is a moderately dormant variety with fall dormancy similar to Lahonton. Flower color observed in the Syn.1 generation is approximately 99% purple, 1% variegated, and a trace of white, cream, and yellow.
4. DK166 has high resistance to anthracnose (race 1), Phytopthora root rot, Fusarium wilt, pea aphid, and spotted alfalfa aphid, with resistance to blue alfalfa aphid and southern root knot nematode. It has moderate resistance to bacterial wilt and Verticillium wilt. Reaction to stem nematode, northern root knot nematode, and Aphanomyces root rot has not been adequately tested.
5. Seed increase is on a limited generation basis with one generation of breeder and two generations of the foundation and certified seed classes. Breeder (Syn.1), foundation (Syn.2 or Syn.3), and certified (Syn.3 or Syn.4) classes will be recognized. Production of Syn.3 foundation seed requires the consent of the breeder. Breeder seed was produced under cage isolation at Woodland, CA in 1989. Sufficient foundation seed for the projected life of the variety will be maintained by Cal/West Seeds. Stands of foundation and certified seed fields are limited to 3 and 6 years, respectively.
6. Certified seed of DK166 will be available in 1993.
7. No decision has been made regarding Plant Variety Protection.
8. This information can be forwarded to the PVP office.
9. Variety name: DK166
Experimental designations: C/W 2677 ; VS-957
Date NA&MLVRB first accepted this variety: January 1993
Dates previous amendments were accepted: January 1995
Date this amendment submitted: November 1, 1998