Bidens frondosa

<br>In South Korea, where B. frondosa is an invasive weed of rice fields, streamsides, roadsides and the margins of fields, Han et al. (2009) surveyed insect herbivores associated with the plant. They found nine species of lepidopteran larvae feeding on the plants. The most likely candidate for a biological control programme was thought to be Hadjina chinensis since it was the most prominent species in both cultivated and fallow paddy fields, the most damaging to B. frondosa and the only herbivorous species restricted to species of Bidens (Han et al., 2009). Further studies however are required to determine whether this agent would be suitable for biological control.