Rampant pear leaf blister mite

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?

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Posts

  • OnopordumOnopordum Posts: 390

    This is pear rust, not blister mite.

  • Onopordum says:

    This is pear rust, not blister mite.

    See original post

     I didn't know rust produced blisters on the underside of the leaves

  • The old guy with the tree says:
    Onopordum says:

    This is pear rust, not blister mite.

    See original post

     I didn't know rust produced blisters on the underside of the leaves

    See original post

     nope rust doesn't produce blisters, so it is definitely pear leaf blister mite

  • BobTheGardenerBobTheGardener Leicestershire, UKPosts: 8,037

    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.

    A trowel in the hand is worth a thousand lost under a bush.
  • BobTheGardenerBobTheGardener Leicestershire, UKPosts: 8,037

    By the way, the sunken bark looks like canker, another common disease affected pears.  You should prune out all affected sections.

    A trowel in the hand is worth a thousand lost under a bush.
  • Dave MorganDave Morgan Posts: 3,123

    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?

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