Last modified: Nov. 25, 2024, 11:40 a.m.
A rare species in Belgium, mainly in azalea nurseries and parks with Rhododendron.
Native
First instars green, later on turning more yellowish.
Underside, brownish blotch mine. Later on a cone by spinning a leaf tip downwards. The cone colours from green to reddish brown.
See also gracillariidae.net and bladmineerders.be.
A whitish, transparant cocoon.
The young larvae make a gallery in the lower epidermis of a leaf of Rhododendron simsii, R. indicum, etc. This gallery leads to a blotch contorting the leaf. Later, the larva constructs a cone by rolling a leaf downwards from the tip.
Pupation on the underside of the leaf, where the larva first spins a whitish, transparent cocoon which is actually just a membrane. The pupa hibernates and after the emergence of the adult, the exuvium protrudes from the mine. The adults come to light.
The adults fly in two generations a year, in May and July–August. In mild seasons, there is a small third generation during September–October.
Oligophagous on Rhododenron.