It's still early in the season so these aren't as "sick" looking as they will get (based on past years' experience). I'm attaching pics of the pears which are developing black spots now and then will develop cracks as they grow. They still taste good overall. Pics of bark now - I have noticed more wispy moss on them in the past and that may still develop. Is the tree diseased or is a soil issue or? Is it salvageable?
They were my dad's before so not mine to interfere but since they are now in my care, I want to fix this if I can.
I really don't know what kind of pear they are. They are more shaped like traditional pears than the Asian pears I have seen in the store but when I do a google image search for Asian pears, there are some that look like them.
Some apples and pears are simply prone to black spot, through a combination of genetics and climate. Conventional growers spray nasty fungicides to combat it, or give up and rip out the trees and replace them with something more resistant.
We've got some apples (esp Gala) that get hit with this and in wetter summers some of the pears get it as well. I try to keep the trees pruned to an open basket or vase shape to improve airflow, but I don't know if that really helps. I have also tried spraying with a horsetail infusion and with a solution of potassium bicarbonate. Both of these seemed to help and neither has any bad side effects that I can see. Might be worth trying them if you have access to them.