On Fri, 25 Mar 2005 12:20:05 -0600, Katra
wrote:


You can place a sheet of 18" aluminum roof flashing about 3 ft. up the
base of the tree all the way around it as a "sleeve". This prevents
anything climbing the tree. It can be removed when they are done
nesting. :-)

Thanks. I had something like that in mind, but I seem to recall that
there was something that could be smeared on the trunk. Like grease,
only more benign.

Elliot

Elliot Richmond
Freelance Science Writer and Editor