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Bark removed to show dry, cankered wood on the basal trunk of a navel orange tree with Phytophthora gummosis, caused by Phytophthora citrophthora.

Phytophthora gummosis, dark, cankered wood on basal trunk of navel orange beneath removed bark. UC Riverside. Credit: David Rosen
Bark removed to show dry, cankered wood on the basal trunk of a navel orange tree with Phytophthora gummosis, caused by Phytophthora citrophthora. Credit: David Rosen
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