John Seets:
Thanks for the info. I find all of George Imirie's Pink Pages to be very interesting. Do you have a link for the one(s) you have made reference to?

I agree that the 1992 H & HB IS a GREAT book about bees. I quote from page 1118, "Colonies can be treated with menthol when there is no heavy nectar flow [Why? field bees not in hive?] and daytime temperatures are expected to reach at least 60* F."

"Menthol placed on the top bars is the prefered method of treatment provided the daytime temperature does not exceed 80 degrees F. During hot weather, the menthol should be placed on the bottom board of the colony."

Do you think the info from Mr Imirie is an update/revision to the PUBLISHED method of treatment?