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New Zealand Plant Protection 67 (2014): 34-40

Relationships between kiwifruit bacterial canker disease and kiwifruit productivity

K.J. Froud, N. Cogger and R.M. Beresford

ABSTRACT

Bacterial canker disease, caused by a virulent strain of Pseudomonas syringae pv. actinidiae (Psa-V) has affected kiwifruit vines in New Zealand since 2010. This study investigated the association of Psa-V with productivity within 'Hayward' and 'Hort16A' varieties. Psa-V infection status and date of diagnosis for 3,309 infected orchards were provided by Kiwifruit Vine Health, while Zespri provided productivity data. Linear regression models were constructed to determine the relationship between production and Psa-V infection in 'Hayward' and 'Hort16A' orchards. Results showed a significant relationship between the numbers of weeks Psa-V was detected in 'Hort16A' orchards and a reduction in productivity. This was likely due to the removal of Hort16A vines or productive areas of canopy in response to the presence of severe symptoms within an orchard. A similar significant relationship was also found in 'Hayward' orchards, although the reduction in productivity was smaller and took longer to develop than in 'Hort16A'.

Keywords: Actinidia chinensis, Actinidia deliciosa, Pseudomonas syringae pv. actinidiae, Psa, linear regression, production, 'Hayward', 'Hort16A', retrospective, cohort, observational study.

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