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Plant Pathology Journal
  Year: 2004 | Volume: 3 | Issue: 1 | Page No.: 19-25
DOI: 10.3923/ppj.2004.19.25
Phosphonate (PO3-) Effectiveness Against Phytophthora cinnamomi Rands on Thryptomene calycina, Banksia grandis and Banksia spinulosa
Nyoman Pugeg Aryantha and David I. Guest

Abstract:
The present study shows that Potassium phosphonate has been proven to slow down the growth rate of P. cinnamomi in in vitro. Phosphonate drench as low as 1 g L-1 was effective in protecting Thryptomene calycina, Banksia grandis and B. spinulosa in pot and field trials. In glass house trials, concentrations as low as 1 g L-1 (drench) significantly suppressed the P. cinnamomi population. Concentrations over 2 1/2 g L-1 were phytotoxic to all plant species tested. The most sensitive species was B. spinulosa. Phosphonate (5 g L-1 ) killed all B. spinulosa plants in seven weeks, therefore it must be used with a great care. Phosphonate treatment alone was effective protecting plants from disease in the field, but did not result in high plant health. Despite new root growth in pot trials after seven weeks, poor growth was commonly observed on T. calycina after 14 months in field trials. This suggests that phosphonate is not suitable as sole application particularly for the long term. A combination of phosphonate with compost as well as antagonist as an integrated management will be a good alternative for P. cinnamomi management in the future.
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How to cite this article:

Nyoman Pugeg Aryantha and David I. Guest, 2004. Phosphonate (PO3-) Effectiveness Against Phytophthora cinnamomi Rands on Thryptomene calycina, Banksia grandis and Banksia spinulosa. Plant Pathology Journal, 3: 19-25.

DOI: 10.3923/ppj.2004.19.25

URL: https://scialert.net/abstract/?doi=ppj.2004.19.25

 
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