Crown gall is a bacterial disease caused by Agrobacterium tumefaciens, which causes the formation of galls on roots, twigs and branches, often close to the ground level.
Signs of damage:
Galls are most commonly found near ground level on the roots and lower branches of the plants. As the galls enlarge, they become woody and hard. The outer layer turns brown and corky. The plant may be weakened and stunted with some branch or tip dieback. Symptoms may not develop immediately after infection. Galls grow most rapidly during the warm months of the year.
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