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Will Phytophthora cinnamomi become resistant to phosphite with its increasing use?

Dobrowolski, Mark, Hardy, G.E.St.J., Tommerup, I.C., Shearer, B.L., Colquhoun, I. and O'Brien, P.A. (2003) Will Phytophthora cinnamomi become resistant to phosphite with its increasing use? In: Phytophthora in Forests and Natural Ecosystems: 2nd International IUFRO Working Party 7.02.09 Meeting, 30 September - 5 October, 2001, Albany, Western Australia.

Abstract

Phosphite is increasingly being used as a means of control for dieback caused by Phytophthora cinnamomi. We wish to study the likelihood of P. cinnamomi evolving resistance to phosphite, given the clonal populations of the fungus present in Western Australia. We have collected isolates of P. cinnamomi from areas where phosphite has been used intensively for up to 15 years (avocado orchards) as well as areas of less frequent use add no use of phosphite. Our testing involved stem inoculating a clonally propagated host (Leucadendron sp.) that was treated with one of three levels of phosphite (0%, 0.25% and 0.5%). We measured the extent of colonisation by each P. cinnamomi isolate after eight days of incubation in a controlled temperature plant growth cabinet. Preliminary results suggest that less aggressive isolates are not present in populations obtained from areas where phosphite has been used. Also, the few isolates that colonise the phosphite treated host to a large extent, all come from areas of phosphite use. Research is continuing to replicate these results and investigate their significance to the control of P. cinnamomi using phosphite.

Publication Type: Conference Item
Murdoch Affiliation: School of Biological Sciences and Biotechnology
Notes: In: JA McComb, GE StJ Hardy and IC Tommerup (eds), 'Phytophthora in Forests and Natural Ecosystems'. 2nd International IUFRO Working Party 7.02.09 Meeting, Albany, W. Australia 30th Sept - 5th Oct 2001
URI: http://researchrepository.murdoch.edu.au/id/eprint/11227
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