When I look up boric acid on the net there are various ads for it to kill roaches but no explanation of why it is effective on roaches. I am in East TX , roach central. When my house was built I put pounds of boric acid in between the studs before drywall went up . For 25 years I don't think I saw a dozen roaches in the house. But starting this spring ,I have killed a few roaches every night . As if they became immune to the boric acid ( as much as I put in ,it could not be gone). We have pets so I am reluctant to use insecticide in the house.
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$\begingroup$ boric acid plus sugar is a common ant control home remedy as well. The belief is that it crystalizes inside the insect and blocks their digestive tract $\endgroup$– JimNNov 8, 2020 at 5:17
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