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New Zealand Plant Protection 66 (2013): 381

Impact of covered structures on Psa-V in kiwifruit vines

S.G. Casonato, S.M. Reynolds, M.A. Manning and I.J. Horner


Trials have been established in three Bay of Plenty kiwifruit orchards to determine the impact of blockscale breathable-plastic covers on the progression of Psa-V (Pseudomonas syringae pv. actinidiae) in pre-infected established vines and in newly grafted uninfected plants. On each orchard there were three replicated covered areas, each spanning four rows and five bays, with the uncovered control areas adjacent. Two sites with established previously infected vines showed little or no reduction in the expression of disease relative to that observed in vines in uncovered control areas. No major progression of disease was observed in one of these orchards. In the second, there was widespread expression of Psa-V symptoms post-girdling, irrespective of whether they were covered or not. In the third orchard, uninfected grafted vines planted under the canopies of mature infected vines remained relatively disease free compared with similar vines not under cover, where numerous leaf spots and secondary symptoms were observed. The trials will continue to be monitored.

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