Bacterial diseases

Tree Diseases Caused By Bacteria

Fire Blight

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Fire blight in flowerling crab. Arrow points to infected branch.

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Canker on flowering crab apple. Bateria overwinter at the edge of the canker and ooze out in the spring.

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Branch symtoms of fire blight showing curling of the branch tips and dead leaves.


Crown Gall

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Gall on roots of tree.

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Large gall on main stem of tree.

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Cross section through a gall on the main stem of a tree showing hypertrophy and hyperplasia of cells.


Wetwood

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Cross section of an elm showing internal wetwood (brown region).