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.
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