Answer: Based on your description this sounds like a problem with flea beetles. Flea beetles are usually active for only about a month, they are also somewhat difficult to control. Whether or not to try to control them depends on how your plants seem to be doing. If your plants are growing well, they should outgrow the damage. If the damage is truly disfiguring or your plants are very young and small, you could treat them with carbaryl (Sevin). Read and carefully follow all of the label directions.
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