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Spatial distribution of Neonectria species associated with beech bark disease in northern Maine

机译:缅因州北部与山毛榉树皮病相关的新菌属物种的空间分布

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摘要

Beech bark disease (BBD) requires prior infestation of bark by an exotic scale insect, Cryptococcus fagisuga, to permit infection by one or more fungi, primarily Neonectria ditissima and Neonectria faginata. Previous studies in North America report a progression in which N. faginata replaces N. ditissima as the dominant pathogen in the BBD complex. To examine the status of the Neonectria populations in forests that have developed for decades with and without BBD a survey was conducted 2005-2006 in northern Maine. Ascospore measurements from 201 beech bark disks containing mature perithecia support reports that, once established, N. faginata dominates the BBD complex. However stands did contain more N. ditissima when other highly susceptible hardwood tree species were present (R2 = 0.775), regardless of disease severity. Abundance of N. ditissima in areas long affected by BBD suggests that N. ditissima, by continually supplying inocula from nonbeech hosts, continues to affect BBD.
机译:山毛榉树皮病(BBD)要求事先用一种外来规模的昆虫Cryptococcus fagisuga侵染树皮,以使一种或多种真菌(主要是Neonectria ditissima和Neonectria faginata)受到感染。北美先前的研究报道了一种进展,其中牛唇猪笼草取代了迪迪斯马猪笼草作为BBD复合体中的主要病原体。为了研究在有和没有BBD的情况下发展了数十年的森林中新菌种群的状况,2005-2006年在缅因州北部进行了一项调查。从包含成熟的皮膜支持物的201个山毛榉树皮盘中测出的子囊孢子报告说,一旦建立,faginata猪笼草将主导BBD复合体。但是,如果存在其他高度易感的阔叶树种(R2 = 0.775),则不论病害的严重程度如何,林分中的确都含有更多的迪迪斯猪笼草。在长期受到BBD影响的地区,ditissima猪笼草的大量存在表明ditissima猪笼草通过不断从非山毛榉宿主体内提供接种物,继续影响BBD。

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