Answer: When plants die suddenly in the heat of summer, it is sometimes caused by a soil borne disease called Cotton (Texas) Root Rot. However, Chilean mesquite is usually tolerant of the disease. The University of Arizona offers a free publication describing this condition more fully. Go to the website at
and go to Diseases of Ornamentals. Choose AZ1150.
Another possibility is that the trees aren't receiving sufficient water through the entire root zone both depth and horizontally. If after reading this publication you don't think that is the problem, send another email describing your watering methods and we'll go from there.
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