Fenusa ulmi - Fenusa ulmi

Description

The larvae of the sawfly Fenusa ulmi produce full depth blotch mines on the leaves of Elm species. The mines usually start from the angle formed by the midrib and a vein. The final mine may occupy a sizable part of the leaf. Frass in black grains, initially often in long pearl chains, in older mines in loose grains. The mines are recorded more frequently than the adults, which are rather plain, black sawflies.

Habitat

Where Elm species are present.

When to see it

The mines occur from early summer once Elm is in leaf.

UK Status

Widespread in Britain but not well recorded.

VC55 Status

Uncommon or under recorded in Leicestershire and Rutland. It is believed that the Claybrooke Magna record of 2nd June 2016 is the first for our area (VC55).

Leicestershire & Rutland Map

UK Map