Center for Medical, Agricultural and Veterinary Entomology, United States Department of Agriculture-Agricultural Research Service, Gainesville, Florida, United States of America.
International Institute of Tropical Agriculture (IITA), Cotonou, Benin.
Sci Rep. 2018 Feb 27;8(1):3710. doi: 10.1038/s41598-018-21954-1.
Fall armyworm (Spodoptera frugiperda J.E. Smith) is a noctuid moth pest endemic throughout the Western Hemisphere that has recently become widespread in sub-Saharan Africa. There is a strong expectation of significant damage to African maize crop yield and a high likelihood of further dispersal, putting the rest of the Eastern Hemisphere at risk. Specimens from multiple locations in six countries spanning the northern portion of the infested region were analyzed for genetic markers. The similarity of haplotypes between the African collections was consistent with a common origin, but significant differences in the relative frequency of the haplotypes indicated limitations in migration. The mitochondrial marker frequently used to identify two host strains appears to be compromised, making uncertain previous reports that both strains are present in Africa. This more extensive study confirmed initial indications based on Togo populations that Florida and the Greater Antilles are the likely source of at least a subset of the African infestation and further suggest an entry point in western Africa. The origin of a second subgroup is less clear as it was rarely found in the collections and has a haplotype that has not yet been observed in the Western Hemisphere.
秋黏虫（Spodoptera frugiperda J.E. Smith）是一种世界性分布的夜蛾科害虫，在西半球广泛存在，最近在撒哈拉以南非洲地区也有广泛分布。预计该虫害将对非洲玉米作物的产量造成重大损害，并且极有可能进一步扩散，使东半球的其他地区面临风险。对来自六个国家的多个地点的标本进行了遗传标记分析。非洲收集品之间的单倍型相似性表明它们具有共同的起源，但单倍型相对频率的显著差异表明迁移受到限制。线粒体标记物常用于鉴定两种寄主种群，但该标记物似乎存在缺陷，这使得之前关于两种种群都存在于非洲的报告变得不确定。这项更广泛的研究证实了最初基于多哥种群的发现，即佛罗里达州和大安的列斯群岛是非洲虫害的至少一部分的可能来源，并且进一步表明西非是一个进入点。第二个亚组的起源不太清楚，因为它在收集品中很少发现，并且其单倍型尚未在西半球观察到。
