Trees and Shrubs forum: Tree leaves turning brown please help

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Jun 28, 2017 7:23 PM CST
I recently moved to Phoenix a few weeks ago and have these trees on my property that are on a irrigation system set to be watered for 3 times a week for 25 minutes but the leaves on all of these trees are turning brown. Am I over watering or underwatering whatever these trees are?

Thumb of 2017-06-29/Jcola79/25d83a

Jun 28, 2017 7:53 PM CST
Here's another picture.
Thumb of 2017-06-29/Jcola79/1a7f72

Name: John
Scott County, KY (Zone 5b)
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Jul 1, 2017 7:49 AM CST
That appears to be a species of Ash - Fraxinus sp. - with pinnate compound foliage arranged oppositely along the branches.

Beyond that, I don't know enough about Phoenix climate to be of much help.
Name: Sue
Ontario, Canada (Zone 4a)
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Jul 1, 2017 8:12 AM CST
I'm not familiar with the climate either but whether three times a week for 25 minutes is adequate depends on how much water is being delivered each time. Is this a sprinkler or drip system? Can you check whether the water has penetrated very far after one of the waterings? Repeated shallow watering will make the trees more susceptible to heat and dry soil.

One other thing I would do is replace the tree ties with something looser before they start to bite into the trunk as the tree grows and damage the tree. It's also good for trees to have a bit of movement rather than be tied rigidly.
Name: Susan
Vienna, VA (Zone 7a)
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Jul 7, 2017 12:25 PM CST
I would take a small branch into a local garden center and see what they think.
The problem could be leaf scorch or some type of disease. Here are links to articles that explain leaf scorch:

I would also get rid of the rocks around the base of the trees; the sun heats them and they bake the roots and dry out the soil. Several inches of pine mulch or pine bark nuggets would be much better for the tree (keep it several inches away from the trunk, though).
[Last edited by Muddy1 - Jul 7, 2017 12:33 PM (+)]
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N. Ohio (Zone 5b)
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Jul 7, 2017 12:55 PM CST
Welcome! Jcola 79
Congrat`s on your new home and all that that entails Smiling
I agree with sooby on both ideas.
Check on how deeply the trees are getting wet after the 25 min.scheduled shallow watering. Then try a deep soaking - 1 hour - and recheck the depth of soil moistness.
Could be they need 1+ hour per week.
Did you plant these trees?
sooby asked sprinkler or drip system?

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