http://www.reeis.usda.gov/web/crisprojectpages/408255.html
" We tested five plant oils for antimicrobial activity and estimated the
minimum inhibitory concentration (MIC). Thymol and Origanum were the most
effective in controlling bacterial growth at the 0.01% concentration for the
emulsified formulation and 0.02% for the slow-release. In vitro trials
indicated that emulsified formulations were more effective at inhibiting
bacterial growth than the slow-release.
"Either formulation of the essential oils added to the culture medium
drastically reduced the growth of bacterial colonies compared with medium
without oils.
"Our results strongly suggest that plant essential oils can be used to
control American foulbrood disease in honey bee colonies even after
resistance to OTC has developed
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