Biological characteristics of Adosomus sp

Adosomus sp. (Coleoptera Curculionidae) is it serious boring insect of Artemisia spp. shrub in Ningxia, Inner Mongolia and Shaanxi in recent years. It occurred one generation each year and overwintered as mature larvae or adults in the roots of Artemisia spp. in Yanchi, Ningxia. Overwintering adults appeared front middle- or late- April to middle-June, and overwintering larvae began to pupate in the middle of May. Adults emerged from late-June to earl August. The beetles laid eggs in the surface of roots with the depth of 2 cm, and individual egg was covered with 1 [approximately] 2cm thickness sand. Larvae were distributed mainly within 12 cm of roots under ground, and mainly, caused damage to roots of Artemisia, spp. Adults fed on the leaves of Artemisia spp. as the supplement of nutrition.