?> 
http://www.stratford-upon-avon.freeserve.co.uk/PENotes/VarroaTreatment.htm

"Thymol crystals are placed in an old honey jar lid placed on the queen 
excluder directly over the brood; an eke is used to provide the necessary 
air circulation (the ekes are also used for feeding fondant). The dose used 
is 8g (approximately 2 heaped teaspoonfuls) per week for four weeks and is 
applied in March - April, before the flow starts and during August 
immediately after the main crop is removed. Cost is approximately 35p per 
four week treatment".

Hadn't been to your site for a while.  I recall we discussed this many years 
ago and it is good to hear that thymol is still working for you.  We 
purchased some this year.  Is it all the same?  Or are there different 
forms/brands?

Since others have not had such stellar success with fumigants and since hive 
configuration details may be very significant, maybe you could help us with 
the details?

Details like: the height of the airspace in the eke, reason for the 
excluder, the size and number of the brood boxes being treated, and the 
entrance number, location, size and orientation, size of the bottom screen, 
space under the bottom frames, etc.?

I notice you also use and excluder under the fondant as well. 

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