My pear tree started getting black leaves last summer and it turned out
to be fire blight. I pruned the tree way back last fall in hope of
saving it. Sorry to say I lost the tree and in a few weeks will be
removing it. I planted the tree 15 years ago and never had a problem
until it was hit with fire blight last year. Hope this isn't the case
with your tree. Welcome to the group. I'm kind of new here myself and
have been learning quite a bit in this fine gardening group

Rich from PA Zone 5-6