IMPACT OF BACTERIAL CANKER OF KIWIFRUIT (PSEUDOMONAS SYRINGAE PV. ACTINIDIAE) ON 'HAYWARD' KIWIFRUIT PRODUCTIVITY
Pseudomonas syringae pv. actinidiae (Psa-V or biovar 3), a bacterium that causes severe bacterial canker in kiwifruit, was first detected in New Zealand kiwifruit in November 2010. It has had a major impact on Hort16A (Actinidia chinensis) and may be impacting Hayward (A. deliciosa) production. An observational study was conducted using existing industry data sets to investigate the impact of time infected with Psa-V on productivity. Psa-V infection status and date of diagnosis for 2,953 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 orchards. Results showed a significant relationship between the numbers of weeks Psa-V was detected in Hayward orchards, however the effect was small. These results will inform the development of multivariable models to determine if this relationship between productivity and Psa-V remains while accounting for potential confounders including region, elevation, management and differences in Psa-V protective spray applications in future research. Completion of the multivariable modelling research will give greater insight into the impact of Psa-V on Hayward productivity.
Froud, K. and Cogger, N. (2015). IMPACT OF BACTERIAL CANKER OF KIWIFRUIT (PSEUDOMONAS SYRINGAE PV. ACTINIDIAE) ON 'HAYWARD' KIWIFRUIT PRODUCTIVITY . Acta Hortic. 1095, 41-43
Actinidia chinensis, Actinidia deliciosa, linear regression, production, 'Hayward', 'Hort16A', retrospective, cohort, observational study