[Arid_gardener] Question from Home-Hort WWW page

[sonyac218 at yahoo.com]

SONYA CHRISTENSEN
14621
sonyac218 at yahoo.com

My daughter has recently moved to Phoenix and I went out to try and help her with some gardening.  She has 10 orange trees.  Two of them have peeling bark and dying limbs.  What is the cause and more importantly what is the solution.  All the trees still have concrete barriers around them that were probably put in many years ago when they were planted.  They are about 2 feet from the tree trunks.  Should they be moved to the drip line?  Thanks for your help.