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Botryosphaeria-Ribis (bacterial)

Botryosphaeria-Ribis (bacterial)
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Plant stem tissues of healthy as well as stressed plants have a canker form through wounds, cracks, sun-scorched bark, leaf scars and branch breaks. Stems of healthy plants callus (harden over) rapidly and the fungus is underneath the callus and may result in a perennial canker when such plants are stressed. Cankers may be open and visible, partially covered by callus tissue or marked by a depressed area underneath the bark. Stems/branches of stressed plants are girdled quickly by rapid spreading and discoloration of the outer wood and the plants may form.