Spatial dynamics and control of a crop pathogen with mixed-mode transmission.
Spatial dynamics and control of a crop pathogen with mixed-mode transmission.
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DOI：
10.1371/journal.pcbi.1005654
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发表时间：
2017-07
影响因子：
4.3
通讯作者：
Gilligan CA
中科院分区：
文献类型：
--
作者：
McQuaid CF;van den Bosch F;Szyniszewska A;Alicai T;Pariyo A;Chikoti PC;Gilligan CA
对于垂直传播的植物疾病，在农场之间转移传染性种植材料的贸易或分享可以成为病原体传播的重要力量，特别是在材料移动的程度可能大于受感染的病媒或接种物的情况下。然后，发生贸易的网络将实现扩散，在试图控制疾病时，考虑这一点很重要。我们认为，种植材料交换可以对成功控制木薯褐条病产生影响，木薯褐条病是影响非洲主要农作物之一的一种重要病毒病。我们使用小农田地的数学模型来确定非正式贸易对病原体传播的影响以及使用清洁种子系统控制病原体的效果，确定可以限制疾病造成的损害的方面。特别是，我们确定了市场的潜在有害影响，以及以社区为基础的疾病控制方法的好处。木薯褐条病影响了木薯的产量，木薯是乌干达重要的生存作物。人们对这种疾病以及它是如何在一片土地上传播的知之甚少，特别是关于贸易在运输受感染的种植材料方面的重要性。尽管如此，为了控制这种疾病，正在实施一些不同的战略。然而，没有考虑到这些战略之间的相互作用，如果不这样做，可能会产生有害的后果；例如，限制贸易可能会减少通过种植材料传播疾病，但同时也可能减少改良的、无病的种植材料的传播。在这里，我们使用数学模型来评估贸易在传播木薯褐条病方面的潜在重要性。我们考虑当贸易受到限制时，感染水平会发生什么，以及如何将贸易限制与清洁种子系统的使用结合起来，清洁种子系统将无病种植材料分发给种植者。我们工作的结果和建议对控制木薯褐条病的战略具有实际用途，更广泛地说，在评估清洁种子战略的有效性方面也是如此。
Trade or sharing that moves infectious planting material between farms can, for vertically-transmitted plant diseases, act as a significant force for dispersal of pathogens, particularly where the extent of material movement may be greater than that of infected vectors or inoculum. The network over which trade occurs will then effect dispersal, and is important to consider when attempting to control the disease. We consider the difference that planting material exchange can make to successful control of cassava brown streak disease, an important viral disease affecting one of Africa's staple crops. We use a mathematical model of smallholders’ fields to determine the effect of informal trade on both the spread of the pathogen and its control using clean-seed systems, determining aspects that could limit the damage caused by the disease. In particular, we identify the potentially detrimental effects of markets, and the benefits of a community-based approach to disease control. Cassava brown streak disease affects yields of cassava, an important subsistence crop in Uganda. Relatively little is known about the disease and how it spreads across a landscape, especially regarding the importance of trade in moving infected planting material. Despite this, a number of different strategies are being implemented in order to control the disease. However, the interaction between these strategies has not been considered and failure to do so could have detrimental consequences; for example, restricting trade may reduce the spread of disease through planting material, but may simultaneously reduce the spread of improved, disease-free planting material. Here we use mathematical models to assess the potential importance of trade in spreading cassava brown streak disease. We consider what happens to infection levels when trade is restricted, and how trade restrictions can be combined with the use of clean seed systems, which distribute disease-free planting material to growers. The results and recommendations from our work are of practical use to inform strategies for the control of cassava brown streak disease, and more generally in assessing the effectiveness of clean seed strategies.
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影响因子：
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