Problems with pear tree. What’s wrong

Question

I have 2 trees one unaffected another close by has inedible fruit.

• 
• 

Answer 1

It could be stony pit virus, which is transmitted during grafting. Replacement is recommended.

https://www.gardeningknowhow.com/edible/fruits/pear/pear-stony-pit-virus.htm

https://www.gardeningknowhow.com/edible/fruits/pear/growing-pear-trees.htm