I always favored Waller's (1980) modified OAC trap. The addition of a trash trap and a ventilated pollen tray also help. On searching, I found these links, although not to his original paper. At the Tucson BeeLab, we commonly caught many pounds each year, and Waller's tests on the wisdom of full-time trapping showed no damage to colonies. This may help you: http://openagricola.nal.usda.gov/Record/IND80036891 or http://www.beesource.com/build-it-yourself/pollen-trap-hosterman-style/ or http://www.mannlakeltd.com/publications/product/WW-215%20Superior%20Pollen%20Trap.pdf or http://www.jstor.org/pss/2844984 (partial only, but might yield a link to publication) or http://www.aces.uiuc.edu/vista/html_pubs/BEEKEEP/CHAPT2/chapt2.html (This last one is probably the best description I found today - links to a good set of plans) - John Edwards On 12/12/2011 4:32 AM, Peter Chiang Mai wrote: > I am exploring pollen traps at present and have seen a picture of the OAC Pollen trap. > Does anyone know where to download either alternative drawings or where to find clear photographs? > *********************************************** 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 Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm