GT 58
1. GT 58 traces to two experimental populations developed near San Juan Batista, CA by screening the varieties Apollo and WL 318 for 1-3 cycles for resistance to Phytopthora root rot, anthracnose, spotted alfalfa aphid and stem nematode. After the final cycle of screening, the WL 318 based population was topcrossed to the varieties Vertus, Sverre and Sabilt, followed by an isolated field cross of the two populations in alternating rows. Approximately parentage is Apollo (50%), WL 318 (35%) and Vertus, Sverre and Sabilt (5% each). Germplasm sources are M. falcata (3%), Ladak (2%), M. varia (10%), Turkistan (9%), Flemish (37%), Chilean (2%), Peruvian (2%), and unknown (35%).
2. GT 58 is intended for use as hay, haylage, greenchop or dehy in the western region of the U.S. where dormant to semi-dormant varieties are adapted. It has been tested in California, Idaho, and Nevada.
3. GT 58 is a moderately dormant variety with fall dormancy similar to DuPuits. Flower color is approximately 85% purple, 15% variegated and less than 1% yellow.
4. GT 58 has high resistance to Fusarium wilt, resistance to Phytophthora root rot and downy mildew resistance to anthracnose, bacterial wilt, and stem nematode and low resistance to Verticillium wilt. It has not been adequately tested for resistance to pea aphid, spotted alfalfa aphid and blue alfalfa aphid.
5. Breeder (Syn. I) seed was produced from an isolated field increase planted to alternating rows of two experimental populations (81-2 and 81-Al). Seed increase is limited to one generation each of breeder, foundation, and certified classes. A 3 and 6 year stand life is permitted on fields producing foundation and certified seed, respectively. Foundation seed production is limited to the San Joaquin Valley of California.
6. Certified seed will be available in 1987.
7. No application for Plant Variety Protection will be made.
8. Information contained in this application may be turned over to the PVP office.