Hmm, I think I found a cheap and easy "biological" control: the application of my shoe on the beetles, after they get shaken off the plants. Fortunately they've limited their attacks to potted plants, and I've been able to carry the plant to a hard surface in the yard where I can shake the plants a few times, then stomp on the beetles when they play dead and fall off. I guess I'll be doing this nightly until I can't find any more.
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