Unknown profuse white moths

Unknown profuse white moths

Observation - Unknown profuse white moths - UK and Ireland. Description: White moths, some with a tiny black marking, others all white. White legs too. Noted sitting still o

White moths, some with a tiny black marking, others all white. White legs too. Noted sitting still on underside of bindweed and fuschia leaves with a small trail of unknown brown furry deposit, as seen in first image.. Did not touch as unsure if this is their waste matter or something else? Therefore would like to know what this is and if it's a part of their process?