Plum Tree Leaves Are Turning Red And Falling Off

Question From: J. Buermeyer - NORTH DAKOTA
Q: I have a Pembina Plum tree, it's about 35 years old. It is July and some leaves are turning red and falling off. It has been very hot and dry here so I have been watering it but doesn't seem to help. It's not a big problem yet but curious if it might be some other problem. Thanks
(Click Images To View Larger Versions)

A:
I would get an on site inspection from a certified arborist, To find one in your area go to tcia.org and enter your zip code.
Best Nancy