Pyrethrum

... what suits the description my teacher said the best. Fogging is also used to do surveys on general insect populations. You fog a tree, say, with pyrethrum and collect and identify all the insects that fall into whatever you're using to catch what falls out of the tree. The nice thing about pyrethrum ...

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... of insecticide. I'm not aware that it is used to apply anesthetics, unless fogging also refers to generally making an aerosol out of a powder. Pyrethrum (powdered Chrysanthemum flowers, basically) is a natural insectide. When ground into a fine powder and forced through a nozzle at high pressue, ...

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