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| Plant Tumors Crown Gall | Galls, Plant | Plant Galls | Crown Galls | Gall, Crown | Gall, Plant | Galls, Crown | Plant Gall | Plant Tumor | Tumor, Plant | Tumors, Plant A localized proliferation of plant tissue forming a swelling or outgrowth, commonly with a characteristic shape and unlike any organ of the normal plant. Plant tumors or galls usually form in response to the action of a pathogen or a pest. (Holliday, P., A Dictionary of Plant Pathology, 1989, p330) |