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eXtreme |
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1. eXtreme is a
synthetic variety with 224 parent plants that were selected sequentially
for multifoliolate leaf expression and for resistance to Phytophthora
root rot and Aphanomyces root rot (race 1). Parent plants were selected
from crosses between selections from three-year old Minnesota and
Wisconsin yield trials. Yield trial source varieties were derived from
various populations that were developed by phenotypic recurrent
selection for high relative feed value (using Near Infrared Reflectance
Spectroscopy), and for resistance to one or more of the following pests:
bacterial wilt, Fusarium Wilt, Verticillium wilt, Phytophthora root rot,
Aphanomyces root rot (race 1), anthracnose (race 1), and
Leptosphaeru1ina leaf spot. Parentage of eXtreme traces to the following
germplasm sources: WinterKing, 9326 and miscellaneous Cal/West Seeds
breeding populations. Approximate germplasm source contributions are as
follows: M. falcata (8%), Ladak (6%), M. varia (27%), Turkistan (3%),
Flemish (49%), and Chilean (7%). 2. eXtreme is adapted
to the North Central and East Central areas of the U.S. and is intended
for use in the North Central, East Central, and Great Plains areas of
the U.S. eXtreme has been tested in Wisconsin, Minnesota, Iowa, and
Pennsylvania. 3. eXtreme is a dormant
variety with fall dormancy similar to FD class 3 check varieties. Flower
color observed in the Syn. 2 generation is approximately 100% purple
with a trace of variegated, white, cream, and yellow. 4. eXtreme has high
resistance to anthracnose (race 1), bacterial wilt, Fusarium wilt,
Verticillium wilt, Phytophthora root rot, and Aphanomyces root rot (race
1), with resistance to pea aphid, spotted a1falfa aphid, and stem
nematode, and moderate resistance to northern root knot nematode (Meloidogyne
hapla). Reaction to blue
alfa1fa aphid has not been adequately tested. 5. Seed increase of
eXtreme is on a limited generation basis with one generation of breeder
and two generations of the foundation and certified seed classes.
Breeder (Syn. l), foundation (Syn. 2 or Syn. 3), and certified (Syn. 3
or Syn. 4) classes will be recognized. Production of Syn. 3 foundation
seed requires consent of the breeder. Breeder seed was produced under
cage isolation near Woodland, California in 1997. Sufficient foundation
seed for the projected life of the variety will be maintained by
Cal/West Seeds. Stands of foundation and certified seed fields are
limited to 3 and 6 years, respectively. 6. Certified seed of
eXtreme will be available in 2003. 7. No decision bas been
made regarding Plant Variety Protection. 8. This information can
be forwarded to the PVP office. 9.
Variety Name: eXtreme. Experimental
Designation: CW 73010. Date
NA&MLVRB first accepted this variety: January
2003. Date
previous amendments were accepted:
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