Dying Shumard Red Oak

Willis, TX(Zone 8b)

Our 1 year old Shumard Red Oak is having leaves brown out (die) near ends of top branches. Planted it late last Spring and watered every other day but when we left for a week in June, we came back to a nearly dead tree. It got no water that week. Our soil is very friable fine sandy and drains fast - you can run water in a post hole and it will never fill. This Spring it came back to life except for the two long vee-shaped at top. Watering about once per week - slow and long. Now the upper branches have leaves dying back. Checked and found only the central 18 inches were getting wet. The outer root zone (drip line) is dry from 1"-24" down. I'm now watering much more and moving the hose all around root zone yesterday. Any other ideas looking at the pix?
Since taking the pix a few days ago, the tree is looking worse, 75% of the leaves are brown. The guy at Trees of Texas, where we bought it, says it's getting too wet, then too dry. Says to water 5 gallons every day this time of year. He also suggest using something called Super Thrive.

Thumbnail by masterdrago
Magnolia, TX(Zone 9a)

Super Thrive is good. Red oaks catch nine kinds of things down here. Too hot to turn red in the fall, sandy fast draining soil. When you planted the rootball, did you break the clay off from around it? That can cause dieback if you didn't. I have 4 types of oaks in my sandy yard, but even the Sand Post Oaks drop leaves all summer. Wish you luck.

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