1. AP 8623B is a synthetic variety
with 113 parent plants. Parent plants trace to three populations selected
for resistance to the following pests: bacterial wilt, Fusarium wilt, Verticillium
wilt, Phytophthora root rot, anthracnose and Aphanomyces. Phenotypic
recurrent selection was used.
Selections were made from a Aphanomyces/Phytophthora root rot evaluation
nursery near Marshfield, WI based on winter survival, vigor and root size
and health. Parentage of AP 8623B traces to Apollo Supreme (68%), and Arrow
(32%).
Approximate germplasm source
contributions are: M. falcata (7%), Ladak (8%), M. varia
(22%), Turkistan (16%), Flemish (38%), Chilean (5%) and Peruvian (4%).
2. AP 8623B is adapted to and intended for use in the North Central and northeastern U.S. for hay and haylage production. It has been tested in Iowa, Wisconsin and Idaho.
3. Fall dormancy is similar to Saranac. Flower color is 76% purple and 24% variegated with a trace of white, yellow and cream.
4. AP 8623B has high resistance to anthracnose (Race 1), bacterial wilt, Fusarium wilt and Phytophthora root rot, resistance to Verticillium wilt and pea aphid and moderate resistance to Aphanomyces (Race 1). Reaction to stem nematode, spotted alfalfa aphid and blue alfalfa aphid has not been determined.
5. Seed increase is limited to one generation each of breeder, foundation and certified seed classes. 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.
6. Certified seed will be available in 1991.
7. Plant Variety Protection will not be applied for.
8. This information can be forwarded
to the PVP office.