James : A study done by Martha Gilliam and Robert Argauer in 1975 (ABJ 115 : 230-234) reported that Terramycin in extender patties is stable at brood nest temperatures for at least 11 weeks. I'm not sure if 1/2 a patty is enough of a treatment though. Someone else might be able to answer that. Adony Melathopoulos Simon Fraser University Vancouver, British Columbia CANADA [log in to unmask] On Fri, 23 Feb 1996, James C. King wrote: > Hi. Last fall I treated my 140 colonies with extender patties for tracheal > mite and AFB control. I am noticing that many colonies now have about half > the pattie remaining, but I'm not sure if this terramycin is still active. > Should I remove the residue and treat again, or will the residue be > effective thru early spring? > > Does anyone have knowledge or an opinion regarding terramycin stability to > help with the above question? Thank you. > > Jim King, Riegelsville, PA >