Plant Pathology Journal 3(1) 2004 : 19-25
I Nyoman Pugeg Aryantha1* and David I. Guest2
1) Dept. of Biology and Research Development Group on Life Sciences, Institut Teknologi Bandung (ITB), Jalan Ganesha 10, Bandung 40132, Indonesia
Tlp./Fax. +62-22-2509165, Email : nyoman@bi.itb.ac.id
*) Corresponding author should be addressed
2) School of Botany, The University of Melbourne, Victoria-Australia
ABSTRACT
Our 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 one gram per litre was effective in protecting Thryptomene calycina, Banksia grandis, and B. spinulosa in pot and field trials. In glass house trials, concentrations as low as one gram per litre (drench) significantly suppressed the P. cinnamomi population. Concentrations over two and a half gram per litre were phytotoxic to all plant species tested. The most sensitive species was B. spinulosa. Phosphonate [5 gL-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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Keywords : Phosphonate, Phytophthora cinnamomi, Thryptomene calycina, Banksia grandis, Banksia spinulosa, phytotoxic, Integrated control
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