Ask a Question forum: Apple tree fungus

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Chicago area
icanhear
Aug 1, 2017 10:17 AM CST
Found bright orange spots on my apple tree leaves and it's late in the season. Is it too late to treat this disease? Photo attached
Thumb of 2017-08-01/icanhear/473002

Name: Philip Becker
Fresno California (Zone 8a)
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Philipwonel
Aug 1, 2017 12:41 PM CST
I would treat it.
Also check into dormant sprays, that are needed. They will solve allmost any problems you will ever have.

Philip 😎😎😎
Anything i say, could be misrepresented, or wrong.
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
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DaisyI
Aug 1, 2017 5:58 PM CST
Do you have Red Cedar trees near by? Did you see any orange fingery things hanging from them? Your apple tree has a fungal disease called rust that is carried by Red Cedar trees.

http://extension.psu.edu/plant...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

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Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Aug 1, 2017 6:16 PM CST
I was thinking the same as Daisy, is there anything like the second picture on this link on the other side of the leaves?

https://www.phillyorchards.org...
Chicago area
icanhear
Aug 1, 2017 6:48 PM CST
I do not see any red cedar trees in the vicinity. From what I understand the spores can travel great distances. I was just hoping it wasn't too late to treat the tree and I was looking for reassurance that my tree isn't in jeopardy
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Aug 1, 2017 8:03 PM CST
It won't kill your tree but it won't be a happy camper either.

The first step is to break the cycle. The life cycle of the rust takes two hosts, one is the apple tree. Besides Red Cedar, Juniper and Arborvitae can also be part of the cycle. Look for the orange things in those trees/shrubs and get rid of them before they release their spores. That will happen next spring about the time the flowers on your apples tree turn pinkish.

The rest of this summer and during fall/winter, rake and dispose of all leaves and prunings in your garbage can. You don't want to harbor the spores in your own yard.

If this becomes a chronic problem, you will have to look for a fungicide that treats rust. The problem is that you might need a license to buy anything that does.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Chicago area
icanhear
Aug 18, 2018 8:30 AM CST
One year later and the apple tree I spoke of in this post last year has the exact same fungus even after I treated the tree from very early spring on. Apparently I'm not using the correct deterrent. Orange spots that produce a spikey growth on the underside of the leaf. What chemical am I searching for in the sprays?
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Aug 18, 2018 1:31 PM CST
Here is an article explaining what Cedar Apple Rust is and a couple suggestions for control:
https://www.phillyorchards.org...

Another article I read (from University of Wisconsin) suggests a fungicide containing one of the following: chlorothalonil, ferbam, dithiocarbamates, mancozeb, metiram, sulfur, thiram, triadimefon, triforine, or zineb.

Remember, the fungicide must be used at the exact right time. None of these products are going to cure your tree. The only way to cure Cedar Apple Rust is to break the cycle by eliminating the other partner plants.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org

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