Pasiphila debiliata, the bilberry pug, is a species of moth of the Geometridae family. It is found from Europe, east to southern Siberia, the Amur region and Japan. The wingspan is 17–19 mm. 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. Discal spot present. Adults are on wing from June to July. The larvae feed on Vaccinium myrtillus.