Schmidt-Jeffris Rebecca A, Huseth Anders S, Nault Brian A
Department of Entomology, Cornell University, New York State Agricultural Experiment Station, 630 W. North Street, Geneva, NY, 14456 (
Department of Entomology, Campus Box 7630, North Carolina State University, Raleigh, NC, 27695 (
J Econ Entomol. 2016 Oct;109(5):2210-2214. doi: 10.1093/jee/tow149. Epub 2016 Jul 24.
European corn borer, Ostrinia nubilalis (Hübner), is a major pest of processing snap bean because larvae are contaminants in pods. The incidence of O. nubilalis-contaminated beans has become uncommon in New York, possibly because widespread adoption of Bt field corn has suppressed populations. Snap bean fields located where Bt corn has been intensively grown in space and time may be at lower risk for O. nubilalis than fields located where Bt corn is not common. To manage O. nubilalis infestation risk, growers determine insecticide application frequency in snap bean based on pheromone-trapping information in nearby sweet corn fields; adult activity is presumed equivalent in both crops. Our goal was to determine if corn planting intensity and adult activity in sweet corn could be used to estimate O. nubilalis populations in snap bean in New York in 2014-2015. Numbers of O nubilalis adults captured in pheromone-baited traps located in snap bean fields where corn was and was not intensively grown were similar, suggesting that O. nubilalis does not respond to local levels of Bt corn in the landscape. Numbers of Ostrinia nubilalis captured in pheromone-baited traps placed by snap bean fields and proximal sweet corn fields were not related, indicating that snap bean growers should no longer make control decisions based on adult activity in sweet corn. Our results also suggest that the risk of O. nubilalis infestations in snap bean is low (∼80% of the traps caught zero moths) and insecticide applications targeting this pest should be reduced or eliminated.
欧洲玉米螟，即欧洲玉米螟（Ostrinia nubilalis (Hübner)），是加工型食荚菜豆的主要害虫，因为其幼虫会污染豆荚。在纽约，受欧洲玉米螟污染的菜豆发生率已变得不常见，这可能是由于广泛种植转基因抗虫玉米抑制了其种群数量。在时空上大面积种植转基因抗虫玉米的地区附近的食荚菜豆田，遭受欧洲玉米螟侵害的风险可能低于转基因抗虫玉米种植不普遍的地区。为了管理欧洲玉米螟的侵害风险，种植者根据附近甜玉米田的性诱捕信息来确定食荚菜豆杀虫剂的施用频率；假定两种作物中的成虫活动情况相同。我们的目标是确定2014 - 2015年纽约甜玉米的玉米种植强度和成虫活动是否可用于估计食荚菜豆中的欧洲玉米螟种群数量。在玉米种植密集和不密集的食荚菜豆田中放置的性诱捕器捕获的欧洲玉米螟成虫数量相似，这表明欧洲玉米螟对田间转基因抗虫玉米的局部水平没有反应。在食荚菜豆田和附近甜玉米田放置的性诱捕器捕获的欧洲玉米螟数量没有关联，这表明食荚菜豆种植者不应再根据甜玉米中的成虫活动来做出防治决策。我们的结果还表明，食荚菜豆受欧洲玉米螟侵害的风险较低（约80%的诱捕器捕获到零只蛾子），针对这种害虫的杀虫剂施用应减少或取消。
