ZG 9641
1. ZG 9641 had 305 parent plants tracing to the varieties TW 4464 (185) and ABI 9142 (120). These varieties were seeded into replicated (6) plots at Warrensburg, Missouri, in September 1992. Plots were grazed continuously for approximately 145 days in 1993, 1994 and 1995. Plots were undercut in September 1995 with the healthiest plants with large symmetrical crowns saved. Breeder seed (syn1) was produced in the greenhouse on the 305 parent plants and harvested in bulk in the spring of 1996. Additional breeder seed was produced in the field near Nampa, Idaho, in 1996 from the original parent plants plus approximately 20 cuttings of each clone transplanted at random and harvested in bulk.
2. ZG 9641 appears to be adapted to the north central and east central regions of the U.S. It is intended for use in the north central and east central regions of the U.S. It has been tested in Iowa, Wisconsin, Illinois, Kansas, and Pennsylvania.
3. Fall dormancy of ZG 9641 is similar to Saranac, the FD 4 check. Flower color of syn2 generation is approximately 70% purple, and 30% variegated with a trace of cream, white and yellow. ZG 9641 tolerance to intensive grazing is similar to Alfagraze.
4. ZG 9641 has high resistance to bacterial wilt, Verticillium wilt anthracnose (race 1), Phytophthora. root rot, Aphanomyces root rot (race 1) and Fusarium wilt and resistance to pea aphid. It has not been tested for reaction to blue alfalfa aphid, spotted alfalfa aphid, stem nematode, and root knot nematode.
5. Seed increase is limited to one generation each of breeder (syn1), foundation (syn2) and certified (syn3) seed classes. Certified seed may be produced from either breeder or foundation classes. A one, three and six year stand life is permitted on fields producing breeder, foundation and certified seed classes respectively. Foundation seed production is limited to the Pacific Northwest. Breeder seed was produced in 1996. ABI will maintain sufficient seed stocks for the life of the variety.
6. Certified seed will be available in 1999.
7. Application will not be made for Plant Variety Protection.
8. This information can -be forwarded to the PVP office.
9. Experiment designations: ZG 9641
Date first accepted this variety: January 1999
Date this amendment submitted: November 1999