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*!?#@! CROWN VETCH

I am planning a 20 acre prairie restoration of land in south
central Iowa going into CRP.  I have a healthy stand of cool season
Eurasian grasses that have been established for over ten years.  Because
the land borders a mid sized river I have a diverse population of
wildlife.  I have read Steve Packard's chapter on interseeding (Tall
Grass Restoration Handbook, Island Press) and I feel that I should
restore using this technique in order to preserve the current wildlife
habitat.  My problem is that numerous patches of crown vetch have
invaded the grasslands from nearby roadside plantings.  My questions
are...with interseeding, will a heathy prairie of native forbes and
grasses overtake and eventually choke out the crown vetch?  If not, will
strategic burns or mowing break down the vetch enough so that native
plants can overtake it?...or, should I spot treat the crown vetch
patches with Round-Up while the native seedlings are establishing? 
Because of the creeping nature of the vetch roots, I do not think I can
successfully hand pull the invaders...or, would it be better to totally
eliminate the vetch by plowing and exposing its roots and disrupt the
animal communities that are already established?  Does anybody have any
ideas or options?  What would be the best way to tackle this one?????? 
Any suggestions would be greatly appreciated.  David Morey, Keokuk
County, Iowa
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