Wingspan c. 17mm.
This is a rare and local species, confined to mature apple orchards in parts of southern England and the south Midlands.
From September, the larva feeds on mistletoe (Viscum album), mining the leaves and forming large blotch or blister mines. When quite young, the larva overwinters in the mine, continuing its feeding in the spring.
The fairly distinctive adult moths are on the wing in July and August. They can be found resting on trunks during the day, and later come to light.