Last modified: April 12, 2021, 11:29 a.m.
A very rare and local species in Belgium.
Wingspan is about 16 mm.
Moths with pure white, undivided inner marginal stripes can be clearly identified as Mompha divisella. However, especially in males, the inner margin is often darkened, which is why such specimens cannot be reliably determined without genital examination.
The larva lives inside the stem of its foodplant and causes a gall generally at one of the nodes. Pupation inside the stem with the head downwards towards the exit hole.
The species hibernates in the adult stage. In mild winters adults have been seen during December and January flying around by daytime. The adults are active at night and occasionally come to light.
One generation a year: from August and, after hibernation, till May.