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1[mass noun] A bacterial disease of plants, especially fruit bushes and trees, which is characterized by large tumour-like galls on the roots and lower trunk.
- ‘There are no current chemical control recommendations for crown gall on grapes.’
- ‘Since blueberries are grown on acid soils and the crown gall bacterium does not grow well in an acid situation, the disease is uncommon.’
- ‘Other diseases include rust, crown gall, anthracnose and petal blight.’
- ‘The primary enemies of Texas vines are Pierce's disease, winter freeze, hail, wind, drought, black rot, cotton root rot, and crown gall.’
- ‘It is important to remember that certain diseases, such as viruses, Eutypa dieback, and crown gall, cannot be directly controlled with pesticides at the present time.’
- ‘Cane blight and bacterial crown gall are two important pathogens of brambles that enter the plant almost exclusively through wounds.’
- ‘It seems to be particularly effective in treating crown gall, a bacterial disease which can weaken or even girdle vines.’
- ‘Several species in the genus Agrobacterium cause plant disorders such as crown gall and hairy roots.’
- ‘The 1600 ha cut rose industry in Zimbabwe was recently threatened by a bacterial disease called crown gall.’
- 1.1[count noun]A large tumour-like gall caused by crown gall disease.
- ‘Cane galls and crown galls can vary in size and are usually white or gray and brown.’
- ‘The plant pathogenic bacterium Agrobacterium tumefaciens induces tumours, called crown galls, on plants.’
- ‘Most crown galls are caused by the bacteria, but be aware that other things can look like them.’
- ‘After infection by Agrobacterium tumefaciens or A. rhizogenes, transformed cells develop either a crown gall or a hairy root, respectively.’
- ‘Remove and destroy declining plants with large crown galls.’
- ‘It has been used with success on rose crown galls.’
- ‘In contrast, many metabolically active bacteroids were observed within the cells and in the intercellular spaces of the effective nodules, in the case of crown galls, there was also no bacterium in any part of the tumours.’
- ‘Two types of crown galls exist: the so-called teratomes are tumors producing shoot- or leaf-like structures or root-shaped excrescences continuously.’
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