Diana's observations and readings agree with mine. I brought up the point since earlier discussion emphasized Tracheal Mite preference for 1-4 day old bees. It seems to me that the recommended test to rank colonies and queens with respect to resistance to T-mite isn't quite as simple as stated. Time of year could make a difference. Also, in northern climates, colonies go broodless for a period. Therefore, when the mites can finally move to new hosts, we may get a wave of infestation, followed by a lag period before then next generation of mites emerges. Results of the screening test might vary depending on where you are in that cycle. At least our model says this will happen. Who knows? Jerry jjbmail@selway,umt.edu