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首页> 美国政府科技报告 >Plant Pathogens as Agents for Biological and Integrated Control of Aquatic Plants
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Plant Pathogens as Agents for Biological and Integrated Control of Aquatic Plants

机译：植物病原体作为水生植物生物和综合防治的试剂

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Field and laboratory observations were made during 1978 and 1979 on species composition and pathology of the phytoplankton and macrophyte communities in University Bay, Lake Mendota, Wisconsin. No evidence was found that pathogens play a significant role in the regulation of seasonal periodicity of phytoplankters or in inter-algal species competition. There was a pronounced general decline in macrophytes between 1978 and 1979 which may have been due to turbidity of the water. Disease appeared to be endemic rather than epidemic in the macrophyte community. All symptoms observed were in the atrophic or necrotic categories. Signs of disease were never apparent. Presumptive pathogens included fungi and bacteria obtained as singular and consistent isolates from surface-sterilized stem or leaf lesions. Demonstration of causality of fulfillment of Koch's Postulates was completed for Fusarium sporotrichioides, which causes stem lesions and apical chlorosis on Eurasian watermilfoil (Myriophyllum spicatum L.). Other presumed pathogens were isolated from milfoil following reinoculation, but did not induce characteristic symptom development. A fungus, identified tentatively as Trichothecium, grew endophytically in Eurasian milfoil and was associated with decline of the plant. Endophytic microorganisms appeared to be common in macrophytes and may offer the best prospect for biological suppression, or as the biological component of an integrated strategy for the control of nuisance aquatic macrophytes.

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