Impact of kiwifruit bacterial canker on productivity of cv. Hayward kiwifruit using observational data and multivariable analysis

Abstract

A virulent strain of Pseudomonas syringae pv. actinidiae biovar 3 (Psa), which causes bacterial canker in kiwifruit, was first recorded in New Zealand in November 2010. This strain has severely affected Actinidia chinensis var. chinensis 'Hort16A' kiwifruit productivity but its effect on green Actinidia chinensis var. deliciosa 'Hayward' kiwifruit productivity has been variable. An observational study design was used to develop explanatory models to quantify the impacts of Psa infection on productivity (tray equivalents per hectare) of Hayward kiwifruit harvested in 2012, using data captured by industry from 2599 orchards. A total of 934 orchards were Psa positive at the end of the study period. Multivariable linear regression was used to model 2012 productivity in the presence of Psa, while controlling for regional differences, elevation, 2011 productivity, harvest dates and application of agrichemicals. The model showed productivity was initially higher in the presence of Psa, and was not reduced until after 1 year of infection. The relationship between protective spray use and productivity was also quantified. It is likely that improved disease management has offset the impact of the disease and future research should consider a reassessment of the effects of disease after longer term exposure to Psa in New Zealand. The use of an observational cohort study to assess disease impacts using multivariable analysis could have wider application in the field of plant epidemiology.

Sulfur-Induced Resistance against Pseudomonas syringae pv. actinidiae via Triggering Salicylic Acid Signaling Pathway in Kiwifruit

“…Bacterial canker of kiwifruit caused by Pseudomonas syringae pv. actinidiae ( Psa ) has become the primary problem in the development of kiwifruit industry worldwide [ 35 , 36 ]. The disease often shows symptoms such as branch canker, leaf necrosis, and flower rot and has serious harm.…”

Response of Soil Microbial Community Structure Mediated by Sulfur-Induced Resistance Against Kiwifruit Bacterial Canker

“…Kiwifruit bacterial canker caused by Pseudomonas syringae pv. actinidiae ( Psa ) is an epidemic disease during the production of kiwifruit (Vanneste, 2017 ; Froud et al, 2018 ), which often results in sudden and severe economic losses and limitations in kiwifruit cultivation worldwide (Luti et al, 2021 ). People have explored various management strategies for controlling this disease (Bai et al, 2022 ), including but not limited to the application of antibiotics or copper and the breeding of resistant varieties (Wicaksono et al, 2018 ).…”

Sulfur Induces Resistance against Canker Caused by Pseudomonas syringae pv. actinidae via Phenolic Components Increase and Morphological Structure Modification in the Kiwifruit Stems

“…Bacterial canker caused by Pseudomonas syringae pv. actinidiae (Psa) is a destructive global disease, and has become the primary problem in developing the kiwifruit industry worldwide [1][2][3]. Bacterial canker seriously affects the yields and quality of kiwifruit.…”