Giant salvinia is an aquatic fern that is invasive in most tropical and subtropical areas of the world. The aquatic weevil Cyrtobagous salviniae (Coleoptera: Curculionidae) is an effective natural enemy of Salvinia. However, the plant is invading more temperate areas with harsher winters in the US, such that the weevil populations can’t establish and overwinter. An agreement was signed between Louisiana State University (LSU) and FuEDEI to search and study cold-hardy strains of C. salviniae in Argentina, under the assumption that these weevils could survive Louisiana winters and attain biological control of Salvinia molesta D. Mitch. (Salviniaceae). Other objectives included the study of the seasonal occurrence, abundance and characterization of reproductive stages of C. salviniae over time in the southern range of Salvinia in Argentina. Also, C. salviniae was introduced in an artificial lake in the suburbs of the city of Buenos Aires, with the objective of controlling a complete Salvinia infestation.