Source: Texas Plant Disease Diagnostic Lab
This year, beginning in the early spring to late summer, there has been many inquiries as to why the post oaks have “suddenly” died. The most frequent symptoms have been described as a rapid appearance of chlorotic (yellow) and/or necrotic (brown and dead) leaves throughout the entire crown. The leaves often remain attached on the twigs, but the trees are dead. Another, alternative scenario has the leaves dropping off to produce a tree with sparse foliage and thin canopies. These latter trees are lingering with various stages of twig and branch die back, but are still alive.
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