Etiology and control of crown gall on potted chrysanthemums

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Abstract
Outbreaks of crown gall in potted chrysanthemums were caused by Agrobacterium tumefaciens biotype 1. The pathogen was inhibited strongly in vitro by ‘Savlon’ and ‘HPMTS’ and moderately by oxytetracycline, but chlortetracycline and streptomycin were not inhibitory at the concentrations used. Although in vivo experiments on the efficacy of ‘Savlon’ and oxytetracycline were inconclusive, they established that numbers of A. tumejaciens on unwounded foliage decline rapidly even in the absence of antibacterial agents. A. tumefaciens could not be recovered from potting soil. The etiology and control of crown gall outbreaks in potted chrysanthemums are discussed.

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