The palearctic ground-weevil Coniocleonus nigrosuturatus feeding on the leaf of common ragweed (Ambrosia artemisiifolia). Common ragweed is the most dangerous weed species in Central-Europe, it couses human illness with its highly allergic pollen, and serious problems in the arable lands as arable weed. In Europe only few species can eat ragweed. This species (Coniocleonus nigrosuturatus) is able to eat the weed in laboratory conditions, and we don't know this species as arable pest.