Variety Description Summary
SW 7410
1. SW7410 is a 134 plant synthetic variety developed from a cross of three populations: SW 7211, SW 7307 and SW 7205. Plants were cross pollinated in a cage using both honey bees and leafcutting bees. Plants were selected from nursery blocks at Mendota, California and a mature hay field near Chowchilla, California. Selection criteria included seed yield,. plant vigor, fine stems, short internodes, and resistance to fusarium wilt, spotted alfalfa aphid and southern root knot nematode. Estimated germ plasm sources are: African(42%), Indian(18%), Turkistan(17%), Chilean(6%), Peruvian(6%), Flemish(2%), M.varia(l%), Unknown(8%).
2. SW 7410 alfalfa is adapted to areas in the Sacramento Valley and San Joaquin Valley of California, where varieties of dormancy ratings 7 and 8 are grown. Yield tests are currently underway in California. Use is intended in the Sacramento and San Joaquin Valleys of California.
3. Fall dormancy of Sw 7410 is 7. Flower color is 99% purple, 1% variegated bloom and a trace of white bloom in the syn. 3 generation.
4. SW 7410 is highly resistant to fusarium wilt and spotted alfalfa aphid, and resistant to phytophthora root rot, bacterial wilt, southern root knot nematode (M.incognita), blue alfalfa aphid and pea aphid. It is moderately resistant to anthracnose and stem nematode, and has low resistance to the northern root knot nematode (M.hapla). SW 7410 was not tested for aphanomyces root rot (Race 1) or for verticillium wilt.
5. Breeders seed was produced in 1994. S & W Seed Company will maintain sufficient Foundation seed for the projected life of this variety. Under certification, the classes of seed will be Breeder, Foundation and Certified Foundation seed will be produced from Breeders seed and/or Foundation seed. Foundation seed will be used to produce Certified seed. Length of stand life allowed for Foundation and Certified seed is four and six years respectively.
6. Certified seed will be available for sale in the fall of 1999.
7. Application will not be made for P.V.P.
8. This information can be sent to the P.V.P. office.
9. Variety name: SW 7410 Date submitted: November 1, 1998 Experimental designations: SW 7410