This Forum will close on Wednesday 27 March, 2024. Please refer to the announcement on the Discussions page for further detail.
Rampant pear leaf blister mite
The old guy with the tree
Posts: 11
I have pear leaf blister mite on all 3 pear trees, and it has got so bad that it has got into the bark. I have tried Pyrethrum based products, but they do not penetrate the hiding places for the bugs, and I will be trying Pyrethrum 5EC again this year, along with cutting off infected branches & leaves. I have found other available products, but they kill bees (Bayer Envidor etc.). Certis Dimilin Flo works well from what I have heard, but 'Pro use only', is this the case, or is it available retail?
0
Posts
This is pear rust, not blister mite.
I didn't know rust produced blisters on the underside of the leaves
nope rust doesn't produce blisters, so it is definitely pear leaf blister mite
Sorry, but it is indeed Pear Rust. Those growths below the orange spots are the spore producing pustules.
http://www.orangepippintrees.co.uk/fruit-tree-problems/pear-rust
This fungal disease needs two hosts - pears and junipers. See the link above for more information. There are no chemicals available for treatment and the best approach is a combination of removing nearby junipers and picking off affected leaves on the pear as soon as you see an orange spot appear.
This topic comes up regularly and you can use the forum search to find previous advice.
It has been a particularly bad year for this problem and all of my pear trees have been affected.
By the way, the sunken bark looks like canker, another common disease affected pears. You should prune out all affected sections.
Have to agree with Bob, his advice is spot on. Loads of this about this year.
hhmmm.... Leaves started out with small dark blotches in early summer, and by late summer, they looked like the above. I assume trees can be afflicted by both blister mites and rust, or are the small black spots something else?