Thank you to all who replied to my post.
  The overwhelming consensus is that there is no definite answer.  I got some 
great advice on removing invasives, and some references that might prove 
useful.  I think that if there is anyone out there looking for a research topic 
for graduate work, or any kind of research this would be a great subject.  
Obviously, not enough is known about what happens to harmful chemicals once the 
plant producing them is dead.  I will do some reading and maybe a small 
experiment and keep you all informed.
  Thank you again.
  Sarah M. Harrelson
  Wayne National Forest
  Ironton, OH

                        
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