3 in one Asian pear. Fireblight?

I have a 3 in one Asian pear. Hosui, Chojuro, and 20th centuries…

The only one I found the black spots is on the 20th century leave. Like 5 leaves, but no sign on the branch.

I also spray it with a pesticide poison for plants that I bought at homedepot.

Can’t it be a bit to strong for the leaves or is it fireblight?

Also thinking Venturia pirina…

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That leaf alone isn’t evidence of FB. It’s more like natural aging or pesticide damage.