Mook
Hello, just a follow up on this earlier posting. Today I visited an
orchard in Nottingham and the owner showed me a case of rust on pears.
Apparently in is starting to appear, there is no cure except to pick
off infected leaves. I have put two pics of the leaf so you can see
what it is like and compare notes with your trees issue.
Apparently when the fungus is ready to spore the underside of the leaf
has claws on it. I did not see it that advanced.
Initially it might only affect a couple of leaves, but will spread,
resulting in early leaf fall and ultimately affect the long-term health
of the tree. You can just pick the leaves off and dispose of them.
As yet it isn't a condition that affects the trees around Doncaster,
but just like Red Lilly beetle, it is spreading further North.
Regards
Clifford
Bawtry, Doncaster, South Yorkshire