Question
I have read a few of your comments regarding problems with Chinese Pistache trees.  My Chinese Pistache's leaves are turning brown and dropping off.  I make sure it is irrigated often because it is very hot in the summer where we live.  Could gophers be causing the problem?  There are no visible above-ground signs or gopher holes, but we are on an acre of land, and do have problems with gophers.  

Thank you for your time in this matter.

Answer
Hi Debbie:

It is my understanding that gophers can nibble on tree roots.  They have a wide range when it comes to diet.  I would focus on the signs if I suspected these critters.  Look for the openings in the ground and also other plants that have similiar symptoms.  I do not think that these animals are going to zero in on only your tree, but damage others in your yard as well.

Regards
Steve