> I agree that a bottomboard under the screen would allow the fallen mites the > chance to come back through the screen and re-attach to thier host, unless > they are somehow trapped with a sticky board or other means. Does your > screen attach to a frame which acts as the bottom board or does the screen > attach directly to the bottom of the hive body with a spacer allowing > entrance on one side? > Please advise When mites are not attached to a host the distance they will travel is limited. At EAS it was stated that the longest distance a Varroa would travel was about 3/4 of an inch. If it does not find a host it stops and waits, many times until it drys up and dies.