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84-27
1. 84-27 is a synthetic variety developed through two cycles of recurrent phenotypic selection for improved pest resistance. The base population was composed of 32, 28, 35, and 96 plants each of WB6422, WB6424, WB6426 and DK120, respectively, which were selected for disease-free foliage and roots and for high forage yield performance from 3-year-old test plots. WB6422, WB6424, and WB6426 were experimental breeding lines of flemish origin obtained from Weibull International of Sweden. The 96 WB selections were reciprocally hand-crossed in the greenhouse to the 96 DK120 selections. Seed was harvested, bulked, and the bulked-seed generation was screened for resistance to Phytophthora root rot and bacterial wilt in sequential inoculations. One hundred plants were selected and intercrossed at random in the greenhouse to produce the next generation (cycle 1). The cycle-1 generation was then screened for resistance to anthracnose (Race 1). Two hundred anthracnose-resistant selections were grown under cage isolation at Warden, WA to produce seed of cycle two, considered breeder seed (Syn 1). Approximate germplasm sources are M. falcata - 6%, Ladak - 5%, M. varia - 19%, Turkistan - 2%, Flemish - 66%, and Chilean - 2%. 2. 84-27 should be adapted to the northern half of the U.S. for production of hay, haylage and dehydrated forage. It has been tested in MD, IL, and WI and is intended for marketing throughout its area of adaptation. 3. 84-27 is a fall-dormant variety, similar to Ranger in fall growth. The range in flower color approximates 5% purple, 94% variegated and 1% cream. 4. 84-27 has high resistance to anthracnose (Race 1), resistance to bacterial wilt, Fusarium wilt, Verticillium wilt, Phytophthora root rot, stem nematode and pea aphid, and low resistance to spotted alfalfa aphid. Reaction to blue alfalfa aphid is unknown. 5. Breeder seed (Syn 1) was produced on 200 plants under cage isolation at Warden, WA. Foundation seed is being produced at Warden, WA in sufficient quantity for the expected life of the variety. One generation of breeder (Syn 1), two generations each of foundation (Syn 2 or Syn 3) and certified (Syn 3 or Syn 4) seed is recognized. Foundation seed must be grown above 40 degrees N latitude. 6. Certified seed will be marketed in 1988. 7. No decision has been made relative to an application for protection under the PVP Act. 8. This information is made available to the PVP office.
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