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引言边缘桉(Eucalyptus marginata Sm.)是澳大利亚西部占优势的用材树种,每年约生产价值2000万美元的锯材。但它受到病害的威胁,局部地方已知是边缘桉枯萎病所致。这种病引起边缘桉以及大部分下层伴生树种和灌木的死亡。枯萎病是由一种微小的土壤中的菌类黄褐疫霉所引起的。有证据表明这种病原菌已传入澳大利亚西部;由于这种菌类的传入和着生,致使病害得以蔓延和加重。
Introduction Eucalyptus marginata Sm. Is the dominant timber species in western Australia and produces around $ 20 million worth of lumber per year. However, it is threatened by diseases, which are known locally to be caused by the blight of marginal eucalyptus. This disease causes the death of marginal eucalyptus and most of the underlying associated species and shrubs. Fusarium wilt is caused by the fungus Phytophthora sp. In a tiny soil. There is evidence that this pathogen has been introduced into western Australia; diseases have spread and exacerbated as a result of the introduction and survival of this fungus.