Doug,
 
If you get an answer to your question (off the conc-l) please let us know
what the poison ivy stuff is.  I have a daughter-in-law who routinely gets
a shot before the spring comes--she's highly allergic to it.
 
I knew what poison ivy looks like, and I guess I now know that poison ivy
and poison oak are the same things.  Latin names would have solved that
problem!!
 
Carol