I'm stunned.
Grease patties?
Double-you-tee-eff???
This is the twenty-FIRST century, and tracheal mite susceptible
queens are nothing more than defective merchandise sold to
unsuspecting beekeepers by queen and package producers who
are selling substandard (diseased!) stock.
Read this:
http://www.ars.usda.gov/Services/docs.htm?docid=2744&page=12
Note that this was published in 1998 (for Pete's Sake!)
I remember that Bee-L was informed of these findings by Allen Dick
in advance of publication of the paper years and years ago.
http://www.honeybeeworld.com/diary/articles/tracheal.htm
Sure, I sample for tracheal mites, and gosh it is tedious to
peer at all those trachea. But if I ever found any actual
tracheal mites, I would be on the phone demanding a full refund
for that batch of queens, and that queen producer would not get
my business again until they fixed their problem.
Friends don't let friends buy cruddy queens.
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