http://www.scialert.net/qredirect.php?doi=pjbs.2005.1142.1145&linkid=pdf
Abstract: The aim of this study was to determine the natural occurrence of Nosema apis in honey bee colonies and evaluated of N. apis presence in colonies after medical treatment with fumagillin and thymol in consecutive 3 years period. For this purpose, 208 honey bee colonies randomly selected for detection of N. apis infection from Aegean ecotype of Apis mellifera anatolica, 1 years old queen in April, 2002. The colony development performances and honey yields were evaluated through the years from 2002 to 2004.
Yücel, B. and D.L. Muhsin, 2005. The impact of Nosema apis Z. infestation of honey bee (Apis mellifera L.) colonies after using different treatment methods and their effects on the population levels of workers and honey production on consecutive years. Pak. J. Biol. Sci., 8: 1142-1145.
This is also part of a short thread from a person who i have been chatting with,may be of intest to some, i am currently using just under 1g of emulsified thymol per gallon of syrup myself,and am very pleased with the results looking at the bee's this spring.Pre 2002 i only fed thymolised syrup,only when i stopped have the nosema and mite problems got worse,so now gone back so to speak to what works well.
extract.
Yes, I use thymol crystals crystals in all my sugar syrup. This will be my 3rd year. I have tried various dosages, up to one gram per gallon, usually 0.5 or 3/4 gram per gallon.
Certainly think it helps with nosema and mite levels, of course it is only legal for mould in syrup, I have done no studies on thymol's effects on mites or nosema but my winter losses are getting lower, only 7% THIS SPRING.
Mite counts taken last Sept were less than 3% and mostly lower, we did have to treat 100 nucs bought from BC in spring of 09, they were 5-10%.
We also feed Fumidil-B and from previous experience we were getting mixed results with year to year comparisons, since the thymol we seem to be more consistent results with wintering and spring build up.