Hi all Supposedly African and Africanized bees are naturally resistant to varroa. I guess it's not the case in Mexico: (Excerpts for review purposes only) > With the appearance of resistance to pyrethroids in varroa from Mexico, several beekeepers indicated a decrease in honey production > New alternative treatments based on thymol crystals, thymol in vermiculite and oxalic acid amongst others, have been implemented > the purpose of this study was to evaluate the efficacy of Apilife Var® and Hive Clean® on the control of varroa under the tropical sub humid climate condition of Veracruz, Mexico, on colonies of Africanized hybrid bees. > Apilife Var® was clearly effective under tropical conditions ... median treatment efficacy of 95.8% ... In contrast, Hive Clean® presented a very limited efficacy with a median of 19.7% > No negative impact of both products on bee population of the treated hives was observed. Bees followed their normal development during all treatment period. Journal of Apicultural Research: Vol 54, No 5 - Taylor & Francis Online www.tandfonline.com/toc/tjar20/54/5 Two commercial formulations of natural compounds for Varroa destructor (Acari: Varroidae) control on Africanized bees under tropical climatic conditions. *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html