The elm casebearer moth (Coleophora ulmifoliella) is a moth of the Coleophoridae family. It is found in Canada, including Ontario. The wingspan is about 13 mm. Adults are tan with grey markings and fringed wings. The larvae feed on the leaves of Ulmus species. Early instars mine the leaves of their host plant. Later instars feed on the leaves externally from within an oval shaped case. The case is created out of leaves and silk and is about 6 mm in length. They feed on the inner leaf tissues.