I have a Red Oak that was planted by a local nursery in 1997, I am just south of Waco. It did great unitl last year, the leaves are sparse and very yellow, turn brown on the ends and have brown spots. Last year I thought it was just a reaction from the drought of 2011. I aerated and used the sick tree treatment with no improvement. I tried Ironite with no improvement. This year it was worse and I called in an arborist who was afraid I might have girdling roots. He used a deep injection fertilizer back in April. It wasn't showing any improvement so a few a weeks ago I aerated again and filled the holes with the sick tree treatment. This morning a removed the dirt around the tree, about a foot out and found it was too deep and have some roots that I think need to be removed from what I have heard Howard say. They aren't girdling the trunk, but they are girdling some of the other roots. I am not sure whether to attempt this myself or have an arborist do it. Either way should I wait until fall to remove them? Attached are pictures.
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File comment: This is way it looks now. The pond has been there for 5 years.
I think I'm having the exact same issue as you but I'm in northern Travis County in Pflugerville just north of Austin. I have 4 trees that I think are Red Oaks, three of them experiencing this problem to varying degrees, but I'm not sure because I'm an extreme novice when it comes to this stuff. The state of one of my trees looks nearly identical to yours. I'll be watching this thread very closely. Thanks for posting such detailed information and good luck!
Joined: Sat Mar 08, 2003 9:01 am Posts: 961 Location: Dallas, TX
Pruning away the smaller of the crossing roots is a good idea. Too much flare exposure is hard to do but filling some of the holes under the roots with native mulch would be fine. My biggest concern is that your tree looks like a pin oak cross. Notice the small "pin" twigs that come out of the limbs at right angles. The Sick Tree Treatment is the best approach.
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