I was collecting some apple scions from a gentleman that has lots of varieties and it was noticed that the one year twigs (those that grew last summer) had some sort of lesion in which the bark of the twig had totally browned, as in dead. The affected area might be the size of a dime, the rest of the twig looks good.
There were no raised portions, no outgrowths. The affected area seems flat, and you have to look pretty discerningly to see it at first. The coloring of the twig would be a little reddish off-color on these lesions, the cambium underneath was brown, dead. We saw it more in some trees, none at all in others. We did not keep track of which had it or not. Should have.
There seemed to be no damage on second year growth, none apparent. Lots of moss and lichens living on the bark tho.
I spent 2 hours looking at all sorts of pictures on the internet trying to ID this critter, no luck.
Could this be a new disease?
Does powdery mildew do this to summer growth?
What do the pro's say?
Any other ideas?
[quote="plumfun":2t46njtj]had some sort of lesion in which the bark of the twig had totally browned, as in dead. The affected area might be the size of a dime, the rest of the twig looks good.
There were no raised portions, no outgrowths. The affected area seems flat, and you have to look pretty discerningly to see it at first. The coloring of the twig would be a little reddish off-color on these lesions, the cambium underneath was brown, dead. [/quote:2t46njtj]
Does it look like this?
Definitely sounds like a fungal canker.
Thanks for replying Fred,
No it doesn't look like the pic you were kind enough to put up. I looked at it again on a stick of scion I have it it not dime-sized, but rather 5 to 7 millimeters circular, and has a sort of bulls-eye look to it, like an archery target. Hope that helps!
Where are the rest of the experts? <!-- s
--><img decoding="async" src="{SMILIES_PATH}/icon_lol.gif" alt="" title="Laughing" /><!-- s -->
FRED Z, You are an expert!
Thank you very much! I think that is it. The verbal description of the young twigs was right on. I wasted alot of time looking for the correct pictures. 
Cause: Cryptosporiopsis curvispora: (sexual: Neofabraea malicorticis), a fungus. The disease is severe in the high-rainfall apple-growing areas west of the Cascades LINK LINK
Here is how I will handle it:
1. Give all scion wood a good hour or two soaking in Daconil, Captan or Kocide solution. I am open to concentrations and times to use.
2. Be sure to not include any such lesions in a graft.
3. Seal all grafted scions within a hard shell of Doc Farwell grafting glue. It would likely disrupt the lifecycle of any fungus as regards sporulation and seals the scion off from the environment.
4. Add a little Daconil to my Farwell glue. Also available to me are Captan and Kocide powder. I am open to concentrations to use.
Thank you very much! 
Plumfun,
Glad I could help. I'm no expert, just good at using Google. Hey, I found this forum, and I live in Illinois. <!-- s --><img decoding="async" src="{SMILIES_PATH}/icon_lol.gif" alt="" title="Laughing" /><!-- s -->
I can't help at all with treatment advice. The only problems I've faced here are swarms of Apple maggots and Plum Curculio.
[quote="Fred Z":39ejxebl]Plumfun,
Glad I could help. I'm no expert, just good at using Google. Hey, I found this forum, and I live in Illinois. <!-- s --><img decoding="async" src="{SMILIES_PATH}/icon_lol.gif" alt="" title="Laughing" /><!-- s -->
I can't help at all with treatment advice. The only problems I've faced here are swarms of Apple maggots and Plum Curculio.[/quote:39ejxebl]
I still consider you the expert! I am sure there are plenty of knowledgable apple people on this forum who for various reasons would not speak up. Therefore, for your bravery, I crown you an expert! You dared to use what knowledge you have. I commend that!!!
Email me if you want rare scion wood, slightly infected tho!
Idyllwild
simplepress
jafar
Marsha H
Viron