The only issues I typically deal with on apples around here is fireblight. Not sure what that looks like on an older tree like yours
These are the 4 main diseases with apples.. 
Discussion
Thanks for the info. Yes, I've seen the scabs before for a couple of seasons..
It says in text from your book if left untreated can lead to black rot. Which maybe my case.
Can you send me the picture of what it says about black eating chapter 18?
I also lost two older pear trees to firelight 5 years ago so that could have spread. Although the apples look pretty healthy with a few scabs and aren't going scorched black like the pears did.
You got it 