Pasiphila debiliata, the bilberry pug, is a moth of the family Geometridae. It is found from Europe, east to southern Siberia, the Amur region and Japan.[1]
The wingspan is 17–. The ground colour is a very delicate, evanescent pale green, the crosslines are much weak, strongest on the veins. — ab. nigropunctata Chant, has only the principal lines, these being marked as strong vein-dots. — grisescens Dietze is silvery grey without a tinge of green.[2] Discal spot present. The larva is light green with scattered, fine, pale bristles.
Adults are on wing from June to July.
The larvae feed on Vaccinium myrtillus.