what is crown gall tumour
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Crown gall,plant disease, caused by the bacteriumAgrobacterium tumefaciens(synonymRhizobium radiobacter). Thousands of plant species are susceptible. They include especiallygrape, members of the rose family (Rosaceae), shade andnuttrees, manyshrubsandvines, andperennialgarden plants.
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symptoms include roundish rough surface gall
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