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Trunk discoloration
Trunks are almost never perfectly colored as shown in text books. There are many variations, some normal and some that indicate problems.
Seepage from internal trunk injury indicating probable trunk decay.
Lichens and spanish moss on the trunk. Click for more.
Bark inclusion indicating weak attachment. See: bark inclusions.
Crapemyrtle bark and bark on other trees is naturally colored. Here you see the natural color along with a large dead region of bark resulting from a large pruning cut.
