Wilson Blake E, Beuzelin Julien M, Reagan Thomas E
Department of Entomology, Louisiana State University Agricultural Center, 404 Life Science Bldg., Baton Rouge, LA 70803 (
Dean Lee Research Station, Louisiana State University Agricultural Center, 8105 Tom Bowman Dr., Alexandria, LA 71302 (
Environ Entomol. 2017 Apr 1;46(2):175-182. doi: 10.1093/ee/nvx036.
The Mexican rice borer, Eoreuma loftini (Dyar) (Lepidoptera: Crambidae), is an invasive pest that was first introduced into southern Texas in 1980 and has been expanding its range eastward along the United States Gulf Coast. The pest attacks rice (Oryza sativa L.), sugarcane (Saccharum spp.), corn (Zea mays L.), and other graminaceous crops, and its establishment in Louisiana is expected to have severe economic impacts on crop production. Range expansion and population distribution of E. loftini were monitored with a network of 77 pheromone traps throughout southwestern Louisiana from 2013 to 2015. Eoreuma loftini was ubiquitous throughout the study region, with male moths captured in every habitat sampled. Spatial analysis revealed the population is characterized by high and low density clusters, with the greatest trap captures occurring in southeastern Calcasieu Parish and southern Jefferson Davis Parish. Trap captures in more northern regions of the study were lower than in southern parishes. Trap captures in areas where the pest has been established for >3 yr were greatest in rice habitats. The weighted mean population center moved eastward at a rate of ∼11 km per year. Human-aided movement of E. loftini was probably not involved in the eastward expansion documented during this study. Seasonal population peaks were detected in March-April, July-August, and October-November. This study indicates this species is continuing its spread eastward along the United States Gulf Coast and will likely become established throughout Louisiana within the next 20 yr.
墨西哥稻螟，Eoreuma loftini (Dyar)（鳞翅目：草螟科），是一种入侵害虫，于1980年首次传入美国得克萨斯州南部，并一直沿着美国墨西哥湾沿岸向东扩展其分布范围。这种害虫会侵害水稻（Oryza sativa L.）、甘蔗（Saccharum spp.）、玉米（Zea mays L.）以及其他禾本科作物，预计其在路易斯安那州定殖将对作物生产造成严重经济影响。2013年至2015年期间，通过在路易斯安那州西南部布设的77个性诱捕器网络对墨西哥稻螟的分布范围扩展和种群分布进行了监测。在整个研究区域内，墨西哥稻螟随处可见，在每个采样栖息地都捕获到了雄蛾。空间分析表明，该种群的特征是高密度和低密度集群，诱捕器捕获量最大的区域位于卡尔卡苏教区东南部和杰斐逊·戴维斯教区南部。研究区域北部的诱捕器捕获量低于南部教区。在害虫已定殖超过3年的地区，水稻栖息地的诱捕器捕获量最大。加权平均种群中心以每年约11公里的速度向东移动。本研究记录的向东扩展过程中，可能未涉及墨西哥稻螟的人为辅助迁移。在3月至4月、7月至8月以及10月至11月检测到季节性种群高峰。本研究表明，该物种正在继续沿着美国墨西哥湾沿岸向东扩散，未来20年内可能会在路易斯安那州全境定殖。
