I doubt fireblight comes in a "minor" form.

Just one leaf affected? Forget about it.
Many leaves affected? Tell us more.

It's not fireblight, but what it is I dunno. Mine get a few leaves like that every year. No big deal.
I plucked off those few leaves when they were small enough to be manageable.

Thank you all.

a few (3) leaves like that on one side of tree. I will pick them off.