Photo © Andy Mitchell
Eupithecia millefoliata, the yarrow pug, is a moth of the family Geometridae. The species was first described by Adolph Rössler in 1866 and it can be found in Europe and Russia.
The wingspan is about 21 mm. The moths flies from June to July depending on the location.
The larvae feed on Achillea millefolium.
Source: Wikipedia
The primary larval foodplant is Yarrow (Achillea millefolium).