Pests and Diseases forum: Strange knots on apple trees

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Name: Dave Whitinger
Jacksonville, Texas (Zone 8b)
Charter ATP Member Region: Texas Master Gardener: Texas Permaculture Raises cows I was one of the first 300 contributors to the plant database!
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dave
Sep 8, 2013 3:21 PM CST

Garden.org Admin

These are really weird. What is it? It's on my dad's apple trees in East Tennessee.

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So Cal (Zone 10b)
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OldGardener
Sep 8, 2013 3:24 PM CST

Moderator

It looks like gall to me. I lost a couple grape vines to it several years ago:

http://www.apsnet.org/edcenter/intropp/lessons/prokaryotes/P...
"In the end, it's not the years in your life that count. It's the life in your years." -Abraham Lincoln
So Cal (Zone 10b)
Cat Lover Forum moderator Avid Green Pages Reviewer Garden Ideas: Level 1
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OldGardener
Sep 8, 2013 3:30 PM CST

Moderator

http://ohioline.osu.edu/hyg-fact/3000/pdf/HYG_3301_08.pdf
has an article on crown gall and shows it infecting the branches of an apple tree.
"In the end, it's not the years in your life that count. It's the life in your years." -Abraham Lincoln
[Last edited by OldGardener - Sep 8, 2013 3:31 PM (+)]
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Name: Dave Whitinger
Jacksonville, Texas (Zone 8b)
Charter ATP Member Region: Texas Master Gardener: Texas Permaculture Raises cows I was one of the first 300 contributors to the plant database!
Garden Ideas: Master Level Beekeeper Garden Sages Avid Green Pages Reviewer Celebrating Gardening: 2015 Plant Identifier
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dave
Sep 8, 2013 7:15 PM CST

Garden.org Admin

Thank you for this. If it is a gall do you think he should look at treating it, or removing it immediately? He is very concerned about it spreading to his other trees. My instinct is to get rid of it, just to be safe, but I also hate to advise him to kill what might be a treatable tree. What do you think?
So Cal (Zone 10b)
Cat Lover Forum moderator Avid Green Pages Reviewer Garden Ideas: Level 1
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OldGardener
Sep 8, 2013 8:20 PM CST

Moderator

I chose to remove and destroy our infected grapes as it seemed to want to spread quickly.
"In the end, it's not the years in your life that count. It's the life in your years." -Abraham Lincoln

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