Food Plant: Birch (Betula)

Egg: Underside of leaf

Mine: September - October

Notes: A large mine, 15-20mm long, more than six creases, in the lower epidermis. The left mine is P.ulmifoliella (on B.pendula) and the right is P.cavella (on B.pubescens)- the size differences between these mines can be seen. 

Data: 24.ix.2005, Thursley Common, Surrey, VC17, John Langmaid, Jim Porter

Image:© Ian Thirlwell