The Mottled Umber (Erannis defoliaria) is a moth of the family Geometridae.

The most frequently occurring pests are the winter moth (Operophtera brumata) and the mottled umber moth (Erannis defoliaria).

Leaves are eaten by the larva of the coastal race of the ash pug moth and by larvae of other Lepidoptera including brown-tail, dun-bar, emperor moth, mottled umber and Coleophora elaeagnisella.

Cotoneaster species are used as larval food plants by some Lepidoptera species including Grey Dagger, Mottled Umber, Short-cloaked Moth, Winter Moth and Hawthorn Moth (Scythropia crataegella).

The Mottled Umber (Erannis defoliaria) is a moth of the family Geometridae.

The most frequently occurring pests are the winter moth (Operophtera brumata) and the mottled umber moth (Erannis defoliaria).