The ash pug (Eupithecia innotata f. fraxinata, originally known by the binomial name Eupithecia fraxinata, but now believed to be a form of Eupithecia innotata) is a moth of the family Geometridae. It is widely distributed in the UK. The caterpillars feed on ash. The species overwinters as a pupa. 1. \n* The flight season refers to the British Isles. This may vary in other parts of the range.