Phytomyza ilicis

Phytomyza ilicis is an Agromyzid fly that causes galls to form on the leaves of Holly.

Anywhere that the host plant grows.

Phytomyza ilicis lays its eggs in May or June, at the base of the petiole of a young leaf (on the underside). Larva initially feeds in mid-rib, later producing characteristic irregular upper surface linear-blotch. Pupation is internal.

Common and widespread in Britain.

Common in Leicestershire and Rutland