[1] Lilac root weevils are shiny, brownish-black beetles, about 0.25 inches (0.6 cm) with long snout (rostrum) and geniculate (elbowed) antennae.

They are common landscape pests, feeding on lilac, euonymous and peonies.

They are commonly present on North American lilac, but seldom create lasting damage to the plant.

Like other root weevils (O. ovatus, O. rugostriatus and O. sulcatus), they often wander into households during hot summer months in search for shade and moisture.

Treatment with pyrethroid-based insecticides is recommended only in cases of severe infestations, and occasional bug is best tolerated or removed mechanically.