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Diseased bark in fruit trees

 
Posts: 67
Location: Nova Scotia, Canada
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Many of my fruit trees are showing signs of sickness. They were planted four years ago and have been showing these signs for several years. I see it especially in apples but also in plums, pears, even the invincible sea buckthorn.

Any ideas what is causing this?

1. Pesticide residue in the wood chips or leaves that I used for mulch?
2. A trace mineral deficiency? I do test the soil and haven't noticed any serious deficiencies in the minerals I tested for.
3. A disease of some sort?
4. An insect pest?
5. Something I haven't even thought of?
20250423_102958.jpg
A small apple tree that isn't growing.
A small apple tree that isn't growing.
20250423_102846.jpg
A plum with cracked bark
A plum with cracked bark
20250423_102455.jpg
Another apple with those little pock marks all over its branches.
Another apple with those little pock marks all over its branches.
 
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The second picture looks like Canker which is a fungal disease.

Recommended treatment include cutting away infected branches and use of a fungicide.

There are all kinds of recipes for homemade fungicide.  Some are fancy and some a simple.

The one I have used was for powdery mildew and it works.
 
Marvin Weber
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Thanks, Anne. I think there might be something like canker on the stone fruits. I suppose that might be because the tree is already weakened from the other problem, whatever that is.

I do sometimes apply whey on the trees when we have it. Stefan Sobkoviak of the Permaculture Orchard recommends it as an anti-fungal.
 
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