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 Pearleaf Blister Mites 
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Joined: Tue Dec 28, 2004 9:09 am
Posts: 138
Location: Canby, OR Z8
Post Pearleaf Blister Mites
A couple of my small pear trees have infestations of these mites that are showing themselves as red dots covering the now unfurling leaves. They don't seem to do very much damage but I'd like to keep their numbers from building too high nonetheless. I tried an oil and lime-sulphur domant spray on a very small tree where I could ensure complete coverage, but it appears to have done no good at all. That was in early February.

Any other ideas? I don't suppose a blast of insecticidal soap would bother them... would it?

Wed Apr 04, 2007 11:02 am

Joined: Fri Feb 09, 2007 1:21 pm
Posts: 425
Location: SW Washington
Post Re: Pearleaf Blister Mites
The site you link suggests doing the spray after harvest.

My sister had them pretty bad on her pear tree last year as well. I was planning to try to apply neem oil to it this spring but didn't get to it and there weren't many rain breaks.

It sounds like it may not have helped anyway.

From reading this winter I was of the impression that once the blisters are forming it is too late. They are already safely under the surface.

my sisters tree last springImage

Wed Apr 04, 2007 9:01 pm

Joined: Tue Dec 28, 2004 9:09 am
Posts: 138
Location: Canby, OR Z8
That's a good picture. Exactly the sort of thing I'm seeing right now. Later the redness goes away and the leaves are left with a russeted and/or blistered appearance. I don't mind living with them this year, but at some point I'd like to do something about them. But what?

Thu Apr 05, 2007 7:55 am
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