Institute for Conservation Biology and Environmental Management, University of Wollongong, Northfields Ave,Wollongong, NSW 2522, Australia.
J Econ Entomol. 2013 Aug;106(4):1517-24. doi: 10.1603/ec13010.
The western corn rootworm, Diabrotica virgifera virgifera LeConte, is a major pest of maize in the United States and more recently, Europe. Understanding the dispersal dynamics of this species will provide crucial information for its management. This study used geometric morphometric analysis of hind wing venation based on 13 landmarks in 223 specimens from nine locations in Illinois, Nebraska, Iowa, and Missouri, to assess whether wing shape and size differed between rotated and continuously grown maize where crop rotation-resistant and susceptible individuals are found, respectively. Before assessing differences between rotation-resistant and susceptible individuals, sexual dimorphism was investigated. No significant difference in wing (centroid) size was found between males and females; however, females had significantly different shaped (more elongated) wings compared with males. Wing shape and (centroid) size were significantly larger among individuals from rotated maize where crop-rotation resistance was reported; however, cross-validation of these results revealed that collection site resistance status was an only better than average predictor of shape in males and females. This study provides preliminary evidence of wing shape and size differences in D. v. virgifera from rotated versus continuous maize. Further study is needed to confirm whether wing shape and size can be used to track the movement of rotation-resistant individuals and populations as a means to better inform management strategies.
西方玉米根萤叶甲，Diabrotica virgifera virgifera LeConte，是美国和最近欧洲玉米的主要害虫。了解该物种的扩散动态将为其管理提供关键信息。本研究使用基于 13 个地标在 223 个来自伊利诺伊州、内布拉斯加州、爱荷华州和密苏里州的 9 个地点的后翅脉序的几何形态分析，评估在分别发现抗轮作和易感个体的旋转和连续生长的玉米中，翅膀形状和大小是否存在差异。在评估抗轮作和易感个体之间的差异之前，研究了性二型性。雄性和雌性之间的翅膀（质心）大小没有显著差异；然而，与雄性相比，雌性的翅膀形状（更长）有显著差异。在报告有抗轮作的旋转玉米中，个体的翅膀形状和（质心）大小明显更大；然而，这些结果的交叉验证表明，收集地点的抗性状态仅比雄性和雌性的形状更好地预测。本研究初步证明了来自旋转与连续玉米的 D. v. virgifera 的翅膀形状和大小存在差异。需要进一步研究以确认翅膀形状和大小是否可用于追踪抗轮作个体和种群的运动，作为更好地告知管理策略的一种手段。
