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crown gall |
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crown gall: see gall gall, abnormal growth, or hypertrophy, of plant tissue produced by chemical or mechanical (e.g., the rubbing together of two branches) irritants or hormones. Chemical irritants are released by parasitic fungi, bacteria, nematode worms, gall insects, and mites. ..... Click the link for more information. . crown gallDisease of plants caused by the bacterium Agrobacterium tumefaciens. Thousands of plant species are susceptible, including especially rose, grape, pome and stone fruits (e.g., apples, peaches), shade and nut trees, many shrubs and vines, and perennial garden plants. Symptoms include roundish, rough-surfaced galls, several inches or more in diameter. At first cream-coloured or greenish, they later turn brown or black. As the disease progresses, affected plants lose vigour and may eventually die. |
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to field-test tobacco plants genetically engineered to resist tumors caused by crown gall disease. The winery's 2,200 acres of Estate vineyards are the site of irrigation, crown gall and integrated pest management research as well as the propagation of virus-free root stock. |
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crown gall
