Center for Medical, Agricultural and Veterinary Entomology USDA-ARS, Gainesville, Florida 32608.
Ecol Evol. 2012 Jul;2(7):1458-67. doi: 10.1002/ece3.268.
Spodoptera frugiperda (J. E. Smith) or fall armyworm is an important agricultural pest of a number of crops in the western hemisphere. In the United States, infestations in corn acreages extend from the Mexican to the Canadian border. Because fall armyworm does not survive prolonged freezing, the infestations annually affecting most of North America are migrants from southern Texas and Florida, where winter temperatures are mild and host plants are available. A haplotype method was developed that can distinguish between these two geographically distant overwintering populations, with the potential to delineate the associated migratory pathways. Several years of collections from major corn-producing areas in the southern, central, and eastern United States were used to map the geographical distribution of the fall armyworm haplotypes. From these haplotype profiles, it was possible to develop the most detailed description yet of the annual northward movements of fall armyworm. The consistency of these results with past studies and the implications on our understanding of fall armyworm biology are discussed. A better understanding of fall armyworm populations and their movement is critical for the development of strategies to predict infestation levels and eventually control this pest in the United States.
草地贪夜蛾（J. E. Smith）又称秋黏虫，是西半球多种作物的重要农业害虫。在美国，玉米田的虫害从墨西哥边境延伸到加拿大边境。由于秋黏虫无法在长时间的严寒中存活，因此每年影响北美的大部分地区的虫害都是从德克萨斯州和佛罗里达州南部迁徙而来的，那里冬季气温温和，有寄主植物。本文开发了一种单倍型方法，可以区分这两个地理位置遥远的越冬种群，并有潜力描绘相关的迁徙路径。利用几年间从美国南部、中部和东部主要玉米产区收集的数据，绘制了秋黏虫单倍型的地理分布图谱。从这些单倍型图谱中，可以对秋黏虫的年度向北迁徙进行迄今为止最详细的描述。本文还讨论了这些结果与过去研究的一致性，以及对秋黏虫生物学认识的影响。更好地了解秋黏虫种群及其迁徙对于制定预测虫害水平的策略以及最终在美国控制这种害虫至关重要。
