Phtheochroa implicata, the plain conch, is a species of moth of the Tortricidae family. It is found in China (Beijing, Gansu, Hebei, Heilongjiang, Jilin), Iran, Japan, Mongolia, Russia and most of Europe. It has also been recorded from North America. The habitat consists of damp areas and woodland edges. The wingspan is 17–22 mm. Adults are sexually dimorphic, the females are plainer than the males. Adults are on wing from June to August in western Europe. The larvae feed inside the roots of Pulicaria dysenterica. The species overwinters in the larval stage.