Apionidae

Adults are 1.5-4.5 mm long and the body is somewhat pear-shaped and blackish brown to black. They are characterized by having clubbed antennae that are not geniculate. A few species are important agricultural pests of field crops and some are carried into produce stores in infested material. The genera commonly associated with infested seeds and tubers are Apion and Cylas. Species of Apion are primarily pests of legumes, and the larvae complete development within the seeds. Adults occur indoors. There are several species of Cylas that bore into the tubers or the stems and climbers of sweet potato (Ipomoea).

Sweet potato weevil, Cylas formicarius elegantulus Adults are 5-6 mm long, and the body is slender, elongate, and antlike. The pronotum is reddish brown and the elytra are bluish black. Full-grown larvae are about 7 mm long and yellowish white; the head is dark brown; the body tapers posteriorly and is slightly C-shaped. Eggs are laid in the soil or in the infested tuber. Larvae bore into the stems and tubers of sweet potatoes, and pupate in the tunnel. Adults are found in the larval tunnels. Development continues in sweet potatoes that are harvested and stored. Adults emerge in storage buildings or in produce markets and stores. This species is common in tropical and subtropical areas, and it has been introduced into southern USA.

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