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Monochroa japonica is a moth of the Gelechiidae family. It was described by Sakamaki in 1996. It is found in Japan (Hokkaido, Honshu, Kyushu) and Korea.
Adults emerge in early summer.
The larvae feed within the stem of Polygonum thunbergii. Pupation takes place within the stem in late spring.
References
Monochroa japonica Wikipedia(Text) CC BY-SA