On 4/16/07 10:42 PM, in article , "Kay
Lancaster" wrote:

On Sun, 15 Apr 2007 22:29:05 -0500, perrylep wrote:
When is poison ivy not considered "dead"..iow...if you spray poison ivy with
a weed/brush killer and the foliage is all brown and dead, is the irritant
in poison ivy still a problem?

The irritating compound in PI, urishiol, is chemically quite stable.
Volunteers exposed to 50-100 year old herbarium specimens developed
the characteristic
rash.

http://waynesword.palomar.edu/ww0802.htm

Kay

I'm itchy just thinking about it.
C