Original post from Bifurcated Carrots
Frank just sent me some pictures of canker on his apple trees.
Canker is a fungal infection that often infects apple trees and I think other fruit trees as well. I did a post on this a few days ago. What I understand is the infection tends to enter the tree through open wounds, as well as the scars left behind when leaves come off the tree in the fall.
First Frank gives three examples of canker at progressively worse stages on different trees:
The last picture is what Frank uses as an example here to show how he treats it, and he pointed out that this is not really that bad. The yellow-green stuff you will see in the picture is lichen and unrelated to the canker infection.
Read the rest of this post HERE.