I ran across this abstract but I couldn't find any discussion on the study...

Publication ahead of print  
Issue  Apidologie
 
DOI  10.1051/apido/2009070 
 

Apidologie 
DOI: 10.1051/apido/2009070
Effect of thymol and resveratrol administered with candy or syrup on the development of Nosema ceranae (Apis mellifera) artificially infected honey bees
Cecilia Costa1, Marco Lodesani1 and Lara Maistrello2 

1  Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca di Apicoltura e Bachicoltura (CRA-API), via di Saliceto 80, 40128 Bologna, Italy 
2  Dipartimento di Scienze Agrarie e degli Alimenti, Università di Modena e Reggio Emilia, via G. Amendola 2, Area San Lazzaro – Pad. Besta, 42100 Reggio Emilia, Italy

Received 20 March 2009 – Revised 6 July 2009 – Accepted 16 July 2009 - Published online 27 November 2009

Abstract - The aim of this study was to evaluate the effect of thymol and resveratrol administered in two different formulation modes (candy and syrup) on the development of Nosema ceranae and on the longevity of honey bees. Emerging bees from a nosema-free apiary were individually infected with 1 L of sucrose syrup containing 18000 spores of N. ceranae, placed in cages, and kept in an incubator at 33 °C and 65% RH. The experimental groups were fed candy or syrup prepared with thymol (100 ppm) or resveratrol (10 ppm). Infection levels were monitored over a 25 day period by removal and dissection of two live bees per cage. On day 25, post-infection bees fed with thymol syrup had significantly lower levels of infection ( million spores/bee) compared to control bees ( million spores/bee). Bees fed with thymol or resveratrol syrup lived significantly longer (23 and 25 days, respectively) than bees fed with control syrup (20 days). Thymol treated syrup appears to be promising in the control of nosema infection. 


Here is the link:
http://www.apidologie.org/index.php?option=article&access=standard&Itemid=129&url=/articles/apido/abs/first/m09043/m09043.html

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