Article from Science Daily
reports tested efficacy of oregano oil against plant beetles.
"ScienceDaily (May 23, 2008) New research in the Society of Chemical
Industry's Journal of the Science of Food and Agriculture shows that
oregano oil works as well as synthetic insecticides to combat
infestation by a common beetle, Rhizoppertha dominica, found in stored
I have been using bay leaf in containers of cereals.