Mint Stem Borer Adults are small, black, snout-nosed beetles about 2 mm long. Larvae are about 3 to 5 mm long, slender, white, legless, and have a brown head capsule. Adults feed on leaves, and larvae burrow inside the stems of the mint plant just above the soil line. Occasionally they bore into the below-ground rhizomes. Host plants: mint, kochia, goldenrod.
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