The movement of plant pathogens between cultivated and natural host communities can result in lost agricultural production and altered microbial or plant biodiversity. Fusarium graminearum incidence was studied in wild grass hosts for 3 years to better understand the ecology of this plant pathogen at the interface of crop fields and nonagricultural environments. Research sites (n = 23) were spread between regions of high and low agricultural production and included both agricultural and nonagricultural fields. Pathogen incidence in living grass spikes and senesced, overwintered stems varied between regions of New York and was lowest in a region with sparser agricultural production (P = 0.001). However, pathogen incidence within regions was similar at both agricultural and nonagricultural sites. The groundcover of crop and wild hosts within 1 km of sample sites were equally effective predictors of pathogen incidence, indicating either host group may drive pathogen spread. Rainfall in the 8 weeks preceding sample collection was strongly correlated with F. graminearum incidence in grasses, as well as an increased prevalence of F. graminearum in Fusarium spp. communities (P = 0.001). Grass species diversity was not associated with a reduction in pathogen incidence, and F. graminearum incidence did not vary among the most well-sampled grasses. These results indicate the pathogen colonizes and spreads in noncultivated grasses in a manner consistent with existing concepts of pathogen epidemiology in cereal crops. Increasing host acreage, whether cultivated or not, could drive the colonization of grasses in remote or protected environments, potentially altering their microbial communities.

植物病原体在栽培和自然寄主社区之间的移动可能导致农业生产损失以及微生物或植物生物多样性发生变化。在野草寄主中研究了禾本科镰刀菌的发病率，历时3年，以更好地了解这种病原体在农田和非农业环境之间的生态关系。研究地点（n = 23）分布在农业高产和低产地区之间，包括农业和非农业领域。在纽约各地区之间，活草尖峰和衰老，越冬茎中的病原菌发病率各异，在农业生产稀疏的地区最低（P= 0.001）。但是，农业和非农业地点的区域内病原体发病率相似。采样点1公里以内的农作物和野生寄主的地面覆盖物是病原体发病率的有效预测指标，表明任一寄主群体均可推动病原体扩散。降雨样品收集前8周是紧密联系在一起相关禾谷镰刀菌发病率的草，以及有增加的趋势禾谷镰孢在镰孢属。社区（P = 0.001）。草种的多样性与病原体发病率的降低和禾本科镰刀菌无关在采样率最高的草中，发病率没有差异。这些结果表明病原体以与谷物作物中病原体流行病学的现有概念一致的方式在未耕种的草丛中定殖和传播。寄主面积的增加（无论是否耕种）都可能促使草丛在偏远或受保护的环境中定植，从而可能改变其微生物群落。