Nagoshi Rodney N
Center for Medical, Agricultural and Veterinary Entomology, USDA-ARS, Gainesville, FL 32608, USA.
J Econ Entomol. 2009 Feb;102(1):210-8. doi: 10.1603/029.102.0130.
Fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is a major pest of corn, Zea mays L., and a significant, but more sporadic, pest of cotton, Gossypium hirsutum L., in the Western Hemisphere. Previous studies showed that the cotton infestations primarily involve a fall armyworm subpopulation known as the "corn-strain" for which corn is the preferred host plant. It was suggested that the fall armyworm infesting cotton originated in corn and spread into secondary hosts as their numbers increased. In this study, high positive correlations were found between corn acreage and fall armyworm infestation levels in cotton. These occurred between areas that are either geographically close or along plausible migration pathways. Formulae were derived from scatter plot and linear regression analysis that can predict infestation levels in cotton based on corn acreage. The implications of these results for describing and predicting fall armyworm population movements are discussed.
草地贪夜蛾，即草地贪夜蛾（J.E. 史密斯）（鳞翅目：夜蛾科），是西半球玉米（玉米属）的主要害虫，也是棉花（陆地棉）的一种重要但更具散发性的害虫。先前的研究表明，棉花受侵染主要涉及草地贪夜蛾的一个亚种群，即所谓的“玉米品系”，玉米是其首选寄主植物。有人认为，侵染棉花的草地贪夜蛾起源于玉米，并随着数量增加扩散到次要寄主。在本研究中，发现玉米种植面积与棉花中草地贪夜蛾的侵染水平之间存在高度正相关。这些相关性出现在地理上接近或沿着合理迁移路径的区域之间。通过散点图和线性回归分析得出了公式，可根据玉米种植面积预测棉花的侵染水平。讨论了这些结果对描述和预测草地贪夜蛾种群移动的意义。
