Forest efficacy trials on phosphite for control of kauri dieback

Authors

  • I.J. Horner
  • E.G. Hough
  • M.B. Horner

DOI:

https://doi.org/10.30843/nzpp.2015.68.5791

Abstract

In 2012 trials were established in four kauri forest sites severely affected by kauri dieback (Phytophthora agathidicida P taxon Agathis PTA) to determine the potential of phosphorous acid (phosphite) as a control tool Baseline assessments of 162 trial trees included canopy disease rating trunk lesion dimensions and lesion activity (recent bleeding/ 20cm intervals around the trunk Control trees were left untreated After 1 year half the previously injected trees were reinjected in all cases with 75 phosphite Phytotoxicity symptoms (leaf yellowing browning or leaf/twig abscission) were noted in some phosphiteinjected trees particularly where the 20 concentration was used After 3 years many more trunk lesions remained active (expressing ooze continued expansion) in untreated trees (585) than in phosphitetreated trees (08) Average lesion expansion after 3 years was 127 cm in untreated and 04 cm in phosphitetreated trees

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Published

2015-01-08

How to Cite

Horner, I.J., E.G. Hough, and M.B. Horner. “Forest Efficacy Trials on Phosphite for Control of Kauri Dieback”. New Zealand Plant Protection 68 (January 8, 2015): 7–12. Accessed July 26, 2021. https://journal.nzpps.org/index.php/nzpp/article/view/5791.

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Papers

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