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Pseudomonas syringae pv. actinidiae (Psa), the causal agent of bacterial canker of kiwifruit, has recently been found in New Zealand. This pathogen has been the object of few studies and little is known about its epidemiology. Yet the development of an effective strategy of control requires an understanding of the life cycle of the pathogen, in particular determining the location of the bacteria in tissues. In this study, the presence of Psa on flowers, symptomatic and asymptomatic leaves and different parts of canes showing symptoms was determined by polymerase chain reaction (PCR) or by direct bacterial isolation. Psa was found associated with angular necrotic leaf spots, with white exudate and in canes. In canes, Psa seemed to be either in the parenchyma leading to production of exudate or in the vascular system leading to wilting. Psa was also found on asymptomatic tissues, where it was probably surviving as an epiphyte.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Presence of <i>Pseudomonas syringae</i> pv <i>actinidiae</i> the causal agent of bacterial canker of kiwifruit on symptomatic and asymptomatic tissues of kiwifruit

Presence of Pseudomonas syringae pv actinidiae the causal agent of bacterial canker of kiwifruit on symptomatic and asymptomatic tissues of kiwifruit