Cambridgeshire,
United Kingdom 
COULD YOU HELP ME IDENTIFY THE PROBLEM WITH MY MOUNTAIN ASH TREE. IT HAS DEVELOPED FUNNY RAISED AREAS ON THE LEAVES. pICTURE ATTACHED. THANK YOU ANNE SIMMONS
20 May, 2010
Answers
HI OB this looks awful could the guest hire someone to treat it?
21 May, 2010
From what I read, if it is Blister mite then there is no cure.
21 May, 2010
Previous question
Looks like a very bad case of Pear leaf blister mite. Sadly there is no chemical available to the amateur. All you can do is to carefull remove every leaf thus affected and burn them. Sorry.
21 May, 2010