Hello

Your question has been submitted to Michigan State University Extension.

Unfortunately, the system doesn’t allow me to assign your out-of-state question to a fruit expert. I can try to help you with some resources.

Common reasons fruit trees don’t bloom-

Frost or freeze damaged flower buds.

Tree is too young.

Too much nitrogen fertilizer.

https://plantvillage.psu.edu/posts/3862-pear-pear-trees-that-don-t-produce-fruit

Your leaves do not look yellow, so iron chlorosis is not likely a problem. However, a soil pH test from a reliable lab will tell you if your soil is too alkaline. Pears prefer soil at pH 6.0 to 6.5. But, Ussurian pear is listed as tolerating a wider range from 5.0 to 7.5. Garden sulfur is used to lower soil pH. But, you must have a starting point to know how much to apply- https://landresources.montana.edu/soilfertility/soilscoop/ss_SoilTestKits.html

- https://www.riley.k-state.edu/docs/lawnandgardenandother/Acidifing%20Your%20Soil.pdf

I can not diagnose the spots on the leaves. Here are some resources, while they are for fruit trees, ornamental pears can be treated similarly-

https://portal.ct.gov/CAES/Fact-Sheets/Plant-Pathology/Disease-Control-for-Home-Pear-Orchards

https://plantpathology.ca.uky.edu/files/mw_home_fruit_productn_b591.pdf

And fire blight for ornamental pear

https://agrilifeextension.tamu.edu/library/landscaping/fire-blight-of-ornamental-pears/

If your local Montana Extension can not help, you may contact MSU Plant and Pest Diagnostics Lab to see if they can assist with diagnosis of the leaf spots. During Covid you first email them your question and pictures, including one showing the whole tree. <personal data hidden>

There may be a fee for their service.

They may request you send samples afterwards, and their sample submission instructions, form, and fee schedule is on their website. https://www.canr.msu.edu/pestid/

I hope this is some help!