A Spatiotemporal Analysis and Dispersal Patterns of the Potato Cyst Nematode Globodera pallida in Idaho
A Spatiotemporal Analysis and Dispersal Patterns of the Potato Cyst Nematode Globodera pallida in Idaho
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DOI：
10.1094/phyto-04-19-0113-r
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发表时间：
2020-02-01
期刊：
影响因子：
3.2
通讯作者：
Knudsen, G. R.
中科院分区：
文献类型：
--
作者：
Contina, J. B.;Dandurand, L. M.;Knudsen, G. R.
马铃薯胞囊线虫 Globodera pallida 是一种全球管制的马铃薯害虫。它于 2006 年在美国爱达荷州首次发现，截至 2019 年 2 月，侵扰面积仅限于 1,326 公顷。 G. pallida 是一种专门的专性定居内寄生虫，在没有马铃薯宿主的情况下可以在土壤中生存长达 30 年。在严重侵染的田地中，线虫可使块茎产量降低高达 80%，主要通过土壤、块茎或农具的移动进行传播。本研究的目的是描述 G. pallida 在受感染田地中的时空模式，并模拟其在爱达荷州东南部的扩散模式。我们使用地质统计工具和模拟模型进行精确制图并描述 G. pallida 发生率与空间配置之间的关系。我们发现线虫在空间上聚集并流行于田地边缘，其扩散模式遵循耕作方向。我们发现，自 2007 年初次划定取样以来，受感染田地中没有马铃薯，每年取样的包囊数量显着减少。禁止马铃薯生长的植物检疫措施导致线虫繁殖停止，而化学熏蒸剂和生物熏蒸覆盖作物的使用则导致虫卵活力显着降低。我们观察到随着与主要侵染焦点的距离增加，包囊患病率出现非线性下降的过程。使用幂律模型来拟合 G. pallida 的扩散能力。这项研究有助于描述爱达荷州的 G. pallida 感染情况。本研究的目的是为政策制定者、行业和研究人员提供有关爱达荷州 G. pallida 的空间格局和景观生态的信息，并促进对爱达荷州控制这种害虫的挑战和机遇的共识。
The potato cyst nematode Globodera pallida is a globally regulated potato pest. It was detected for the first time in the United States in the state of Idaho in 2006, and as of February 2019, the infestation is limited to 1,326 hectares. G. pallida is a specialized obligate sedentary endoparasite that can survive in the soil for up to 30 years in the absence of its potato host. In highly infested fields, the nematode can reduce tuber yields up to 80% and is spread mainly through the movement of soil, tubers, or farm equipment. The objectives of this study were to describe the spatiotemporal pattern of G. pallida in infested fields and model its dispersal patterns in southeastern Idaho. We used geostatistical tools and simulation models for precise mapping and to describe the relationships between G. pallida incidence and the spatial configurations. We found that the nematode is spatially clustered and prevalent around edges of fields, and its dispersal pattern followed the direction of cultivation. We found that the absence of potato in an infested field significantly reduced the number of cysts sampled each year subsequent to the initial delimitation sampling in 2007. Phytosanitary measures prohibiting the growth of potato contributed to stopping nematode reproduction, and the use of chemical fumigants and biofumigant cover crops contributed to a significant reduction in egg viability. We observed a process of a nonlinear decline in the prevalence of cysts as the distance separation from the primary infestation focus increased. A power law model was used to fit G. pallida dispersal capabilities. This study contributed to describing G. pallida infestation for Idaho. The goal of this study is to provide information on the spatial pattern and landscape ecology of G. pallida in Idaho for policy makers, industry, and researchers as well as facilitate common understandings on the challenges and opportunities for controlling this pest in Idaho.