Answer: I'm not sure what exactly your beetle pest is; there are so many possibilities I'd need to see one. But one pest control method that might work for you is a row cover. As soon as you plant your basil, cover with a floating row cover -- these are made of a very lightweight fabric that can be left on the plants throughout the growing season. Secure the row cover around the bed by burying the edges in the soil. This should help exclude your pests.
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