Plant Tumors

**Definition:** 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)

**Tree numbers:** - G15.610.700

**Synonyms:** - Galls, Plant - Plant Galls - Crown Gall