Whos been munching on these sycamore leaves?

My workmate pointed out that all the sycamores along the road we were on had brown leaves. On smaller trees all the leaves were brown and dry, on larger trees the tops seemed uneffected. It looks like insect damage (sawfly?) but we couldn't find any on the leaves. Hundreds of trees have been effected along this road and my workmate said he had seen sycamores likie this along the cannal to.

What do you think is causing this?

Are there sycamores in your areas that are being affected?

Here is an image of some leaves. They are scanned so the colour is a bit off.

Could you post the photos in this thread please, or we'll have to log onto facebook for access. Thanks

Here you go.

Sorry. I have worked out how to attach files now, here it is.

Didnt see that Nick had done it already. Whoops.

It's usually mites. Same thing happens here.

Any other information on the mites? are they the gall forming mites?

Can any one point me in the right direction on this one or recommend a good insect pest resource?

I really should get a book on insect pests.

could be this sycamore leaf blotch (miner), more advanced though

Could be the sycamore leaf blotch miner. The damage, looks similar. Not totally sure though. Must be a massive population of the little leaf munchers.

Who else has seen these whilst out and about?

we get alot of anthacnose from excessive rain and lacebug.your pic looks like leaf gall .