Host specificity of Asian <Emphasis Type="Italic">Chrysochus</Emphasis> Chevr. in Dej. (Coleoptera,Chrysomelidae: Eumolpinae) and their potential use for biological control of invasive <Emphasis Type="Italic">Vincetoxicum</Emphasis> species

Three Asian leaf beetles of the genus Chrysochus were investigated as potential biological control agents of Vincetoxicum rossicum and V. nigrum, invasive weeds in northeastern North America. Chrysochus chinensis and Ch. globicollis were collected from a field host in a different genus and subtribe. Preliminary no-choice laboratory tests with Ch. goniostoma showed that its physiological host range is too broad. Based on these data, we are not considering these three species as potential biological control agents of invasive Vincetoxicum species.