Strange "thing" on my crab apple leaves

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Strange "thing" on my crab apple leaves

Post  yamasuri on Tue Aug 20, 2013 8:45 pm

I just noticed spots on my crab apple leaves.From the top looks like yellow circle. From the bottom like spikes? Pests? Fungus? Never seen such thing. Any help will be appreciated. Thanks.



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Re: Strange "thing" on my crab apple leaves

Post  Tom on Tue Aug 20, 2013 8:59 pm

I think it's a gall, potentially caused by Cedar Apple Rust.
http://blog.planetnatural.com/pest-problem-solver/plant-disease/cedar-apple-rust/

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Re: Strange "thing" on my crab apple leaves

Post  coh on Tue Aug 20, 2013 9:37 pm

Looks like what I had on my pear last summer:

Questions about pear rust

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Re: Strange "thing" on my crab apple leaves

Post  yamasuri on Tue Aug 20, 2013 9:54 pm

Thank you so much Tom and Chris. It's clear enough. Can I use Bordo or has to be Bonide?

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Re: Strange "thing" on my crab apple leaves

Post  JimLewis on Tue Aug 20, 2013 10:06 pm

Just remove and destroy the leaf or leaves.

A spraying with lime sulfur in late spring will help reduce the likelihood of infection. Keep the tree a long way away from junipers (but if they grow all around you like here, you just learn to live with it).

Cedar apple rust (and other rusts of members of the rose family) isn't a serious problem. Just destroy affected leaves.

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Jim Lewis - lewisjk@windstream.net - Western NC - People, when Columbus discovered this country, it was plumb full of nuts and berries. And I'm right here to tell you the berries are just about all gone. Uncle Dave Macon, old-time country musician

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Re: Strange "thing" on my crab apple leaves

Post  yamasuri on Wed Aug 21, 2013 12:52 am

Thanks Jim. I just burn all affected leafs. Will give lime sulfur spray soon.

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Re: Strange "thing" on my crab apple leaves

Post  John Quinn on Wed Aug 21, 2013 1:36 am

I had this several years ago on a crab apple...it sure looks malignant!

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Strange thing on crabapple

Post  bonsaisr on Wed Aug 21, 2013 2:51 am

Those things sticking out are spores. They will infect junipers. The year after next, the junipers will infect apples.
Lime sulphur will do nothing at this stage. In the winter, spray with lime sulphur or dormant oil. For next year, ask your extension agent for the spraying schedule.
Iris

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Re: Strange "thing" on my crab apple leaves

Post  yamasuri on Wed Aug 21, 2013 11:37 am

Thank you Iris. Such annoying thing this galls.

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Re: Strange "thing" on my crab apple leaves

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