BSI, you may accept a +rep from time to time, but last january, when you made that post, was not the time...
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i'd just like to clear up a minor discrepancy, i.e., that the active ingredient in mosuito dunks is NOT made from chrysantemums (i think you are referring to the pyrethrin insecticides) but it is bacillus thuringiensis, a bacterium that is toxic to the larvae of some species of insects. it seems to be effective against fungus gnats although not sure how effective it is against thrips. couldn't hurt to try, however. good luck...