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New Zealand Plant Protection 66 (2013): 178-183

Survival of Pseudomonas syringae pv. actinidiae in non-kiwifruit green compost

J.L. Vanneste, J.M. Oldham, G. Clark and C.M. Felman

ABSTRACT

Pseudomonas syringae pv. actinidiae (Psa), the causal agent of bacterial canker of kiwifruit, can survive in the environment outside its host. Determining where Psa can survive in the environment is important to limit the incidence and spread of this disease. Composts are sometimes used in kiwifruit orchards and the goal of this study was to determine the risk associated with such a practice. Three commercially prepared composts made from nonkiwifruit green waste were analysed for presence of Psa and for the ability of Psa to survive. Psa was not found in any of the composts analysed. An antibiotic-resistant derivative of Psa biovar 3 (previously Psa-V) used in this experiment could not multiply in any of the composts and its population declined rapidly. Live Psa could not be detected 7 days after inoculation. In sterile composts, Psa could be detected for at least 8 days after inoculation.

Keywords: bacterial canker of kiwifruit, source of inoculum, epidemiology.

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