there are enough variation on beetle traps that you might be well advised to talk about the kind of beetle trap you are considering. some traps are of course much more effective than others... with some small things can help in their effectiveness. I think (I don't much like to use those things myself beyond some experimentation now and then) that almost any kind of oil (I think the one or two types of traps I tried I placed canola oil in these) will work?????
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