dmc,
You're in the heart of fireblight country. Some varieties are exquisitely sensitive, others are tolerant - take a lickin' and keep on tickin' - but none, that I'm aware of are totally resistant to it.
I've lost a few apples/pears/quince to FB through the years, but if they can't make it under my (lack of) management scheme, they don't belong here anyway.
I try to prune out FB strikes whenever possible, but I've got a bunch of blackened shoots in several pears out in my orchard right now that I've just not gotten around to cutting out, and I'm not fretting over 'em. They look to have progressed as far as they're going to this season. I will prune 'em out at some point, if only to diminish the potential for them to act as a source of new infection next year.

Stay tuned for opinions/recommendations from orchardists who have a more hands-on approach.

thanks lucky,
I have gone back and forth on how aggressive to get with this... The tree I left is a unknown dont have any idea what type yet but I planted a dwarf gala fifteen feet from it that I (now) know get fire blight easy. I'm originally from Okla and though I remember reading about fire blight I don't think I even saw it so this is new to me. The apple tree has some yellowing of the leaves is this a secondary problem or a stress response from a fire blight infection?
The bradford pears around me that are blighted don't seem to be yellowing.

Cedar(juniper)-apple rust will be your constant companion, as well, and may be the yellow you're seeing?