Lesson learned on my end. With screened bottom boards, make sure you do a better job sealing the hive up before, during, and after vaporization. Great info, do you see any other advantage/disavatage from screedned? And what zone are you in? Here in central il, I seem to have brood problems with screens. Queens keep moving up and away from tehj screen except in mid summer. Charles *********************************************** 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