Editing Slender pug (section)

===Larva===
The [[larva]]e feed internally on the [[catkin]]s of male willows and externally on female catkins from February to April. They are mostly found on goat willow ([[Salix caprea|''S. caprea'']]) but also on eared ([[Salix aurita|''S. aurita'']]) and grey willows ([[Salix caprea|''S. caprea'']]).<ref name="amr"/> Fully grown, a larva is 14−16&nbsp;mm long and has a dull-green body with indistinct blackish markings along the dorsal area. The head is almost black and the first segment is marked with brown.<ref name="porter">{{cite book |last1=Porter |first1=Jim |title=The Colour Identification Guide To Caterpillars of the British Isles |date=1997 |publisher=Viking |location=London |isbn=0-670-87509-0 |page=47}}</ref>