The future of phosphite as a fungicide to control the soilborne plant pathogen Phytophthora cinnamomi in natural ecosystems

The issues that influence the application of the fungicide phosphite (phosp honate) to natural plant communities affected by Phytophthora cinnamomi Ran ds are complex. Research has shown significant protective effects that are valued in the preservation of rare and endangered plant species and communi ties. However, phosphite does have other effects that include phytotoxicity , growth abnormalities, reduced reproductive capacity and large difference in levels of P. cinnamomi control between plant species. Clearly a balanced approach needs to be adopted when using phosphite for the management of P. cinnamomi in natural ecosystems. It is necessary to take into account the beneficial and detrimental effects of phosphite and the possible loss of pl ant species if the fungicide is not used. Traditional forms of P. cinnamomi management are also outlined to highlight their continued importance in di sease management, irrespective of whether phosphite is used or not.