Two trees - leaf id

I've always had a blind spot with trees, for some reason I struggle with all but the most obvious and frequent. These were seen yesterday. I'm guessing the second are hazel, and would be especially interested in any ideas re the disease which has obviously afflicted it.

 

1. Looks like Salix caprea...common name Goat willow.
2. Doesn't look right for Corylus avellana...common name Hazel.
which have alternate leaves.


corylus avellana alternate leaves - Google Search

Maybe Alnus glutinosus....common name Alder with leaf galls.

alnus glutinosa leaf gall - Google Search:


Pics not completely clear.Please can you add more.
please look for any other clues...catkins, cones.