It depends on what type of insect is doing that. Check the plants early and late in the day for signs of insects. If you find none go out at night with a flashlight as some insects are nocturnal.
If it is beetles or grasshoppers there are numerous products at your local Home Depot for controlling these insects. If it is caterpillars try the low toxicity option by spraying the foliage with a product containing the ingredient B.t. The employees at you Home Depot garden center can assist you with finding these products at their store.
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