Adults are green triangular-shaped insects which are blunt in front and pointed at the rear. Young are similar to adults but are brownish, have no wings, and have numerous spines over the back. Young soybean plant stems are fed upon near the soil. Feeding punctures girdle the stem, and plants frequently lodge during cultivation or windy periods. Lodging may result long after the damage occurred and is usually not yield reducing.
Adults are charcoal gray beetles with very long antennae.
Commonly found in the crown of ragweed during July and early August. Larvae are cream-colored, legless grubs which tunnel the stems of soybeans, ragweeds, and other plants. The larva is the damaging stage. Infested soybean plants are tunneled and cut off at the base. Cutting off occurs after the plants have matured.