It is of course a toxic pesticide, but just fyi the ear tags used for cattle to deter flies are wickedly deadly to thrips, which are a type of fly. Using them indoors goes against the manufacturer recommendations, and you're not supposed to touch the tags with your bare hands. But unlike sprays they don't have to touch your plants, which is what I like. Plus you can put them away in a few days after all the thrips are dead.
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