Effect of a protectant copper application on Psa infection of kiwifruit trap plants

  • J.L. Tyson The New Zealand Institute for Plant & Food Research Limited, Private Bag 92169, Auckland, 1142, New Zealand
  • S.J. Dobson The New Zealand Institute for Plant & Food Research Limited, 412 No. 1 Road, RD2, Te Puke, 3182, New Zealand
  • M.A. Manning The New Zealand Institute for Plant & Food Research Limited, Private Bag 92169, Auckland, 1142, New Zealand
Keywords: Pseudomonas syringae pv actinidiae, Actinidia chinensis var chinensis ‘Hort16A’

Abstract

Pseudomonas syringae pv. actinidiae (Psa) causes bacterial canker of kiwifruit, which is an ongoing threat to New Zealand kiwifruit production. Disease control depends on orchard practices such as removal of visibly diseased material, pruning during low-risk periods, and the application of foliar bactericides. Although the use of copper compounds on Actinidia species (kiwifruit) can cause phytotoxicity, copper-based formulations remain a key component of Psa control in New Zealand. The effect of single copper applications on Psa infection of ‘Hort16A’ trap plants was studied over the Spring of 2014 (Sept–Nov). Psa leaf spots were observed at the beginning of October, appearing first on the untreated plants. Although the copper sprays did not achieve complete protection, particularly as the inoculum built up during November, the copper-sprayed plants always had less disease than the untreated plants.

Published
2017-07-26
How to Cite
Tyson, J., Dobson, S., & Manning, M. (2017). Effect of a protectant copper application on Psa infection of kiwifruit trap plants. New Zealand Plant Protection, 70, 310-314. https://doi.org/10.30843/nzpp.2017.70.65
Section
Vol 70 Kiwifruit & Grape Pathology 2017

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