A mature live oak that began browning after a pond was built around it—surrounded on three sides by water—may be suffering from a drastic change in soil moisture and aeration. Even though the pond was outside the drip line, the excavation and altered water table can sever roots and change drainage patterns.
There’s no quick fix. The tree’s decline over a year, with no visible pests or decay, points to root-zone stress. Contact your county Extension office for a free on-site evaluation; an arborist can assess whether the tree can stabilize or should be removed for safety.
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