Polygonum species (knotweeds) are used as food plants by the larvae of some Lepidoptera species including: Monophagous Species which feed exclusively on Polygonum Coleophoridae Several Coleophora case-bearer species: C. borea C. shaleriella Polyphagous Species which feed on Polygonum and other plants Gelechiidae Chionodes discoocellella Geometridae Idaea aversata (riband wave) Idaea biselata (small fan-footed wave) Orthonama obstipata (gem) – leaves Timandra comae (blood-vein) Noctuidae Agrotis clavis (heart and club) Agrotis exclamationis (heart and dart) Axylia putris (flame) Euxoa nigricans (garden dart) Melanchra persicariae (dot moth) Orthosia gothica (Hebrew character) External links Polygonum +Lepidoptera