The ragwort plume moth or ragwort crown-boring plume moth (Platyptilia isodactylus) is a moth of the Pterophoridae family. It is native to central Europe, Mediterranean North Africa and southern Europe. It has also been recorded from China. It has been introduced in Australia as a biological control agent for ragwort. The larvae feed on Senecio jacobaea, Senecio aquaticus and Senecio nemorensis.