I had an hour's search of our garden elm this afternoon looking for active leaf-mines and managed to find just two each of Stigmella ulmivora and Stigmella viscerella. Both have green larvae, although they are slightly different shades of green, but they mine in completely different ways with viscerella producing a distinctive gut-like pattern. There was no sign yet of the third nepticulid species found on elm, Stigmella lemniscella (yellow larva), but I'm sure it will appear soon because all three are reasonably common here even though the number of trees is dwindling thanks to Dutch Elm Disease.
|Mine of Stigmella ulmivora, Westcott 27th September|
|Mine of Stigmella viscerella, Westcott 27th September|
Dave Wilton Westcott, Bucks