Hi Don &All When I saw your first slide, I thought it would be good to show several slides at different times of the year. Most obvious to me are polinia of milkweed in July. Then I looked at your second slide! Is that what is shown? Bob Darrell Caledon Ontario Canada 44N80W > > I'd be pleased to collaborate with others in order to share a document which > would offer peer reviewed guidance on this subject. > *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html