Kansas State University, Southwest Research-Extension Center and Department of Entomology, 4500 E. Mary St., Garden City, KS 67846, USA.
J Insect Sci. 2011;11:49. doi: 10.1673/031.011.4901.
The Dectes stem borer, Dectes texanus LeConte (Coleoptera: Cerambycidae), is an increasingly important pest of soybean and sunflower in central North America. Nine large-scale field trials were conducted over a 3-year period to determine if Dectes stem borer could be managed with insecticide treatments. Aerial applications of lambda on July 6, 12 and 15 were successful in significantly reducing adults, but applications on July 1, 20 and 24 were less successful. These data suggest that for central Kansas two aerial applications may be required to control Dectes stem borers in soybean. Based on our experience the first application should be made at the peak of adult flight about July 5(th) and the second application 10 days later. The local treatment schedule should be developed to follow the local Dectes stem borer adult emergence pattern. Treated aerial strips 59 m (195 ft) wide were not large enough to prevent reinfestation, but treated half-circles (24 ha or 60 acres) were successful in reducing in Dectes stem borer infestation of soybean. Sweep net samples of adults were not successful in identifying a treatment threshold, so treatment decisions will need to be based on field history of infestation. Further studies are needed to identify better sampling methods that can be used to establish treatment thresholds and to refine the best timing for treatments.
德克斯特茎蛀虫，Dectes texanus LeConte（鞘翅目：天牛科），是北美中部大豆和向日葵日益重要的害虫。在 3 年的时间里进行了 9 次大规模田间试验，以确定是否可以通过杀虫剂处理来控制德克斯特茎蛀虫。7 月 6 日、12 日和 15 日进行的空中喷洒氯菊酯成功地显著减少了成虫，但 7 月 1 日、20 日和 24 日的喷洒效果较差。这些数据表明，对于堪萨斯州中部，可能需要进行两次空中喷洒才能控制大豆中的德克斯特茎蛀虫。根据我们的经验，第一次喷洒应在成虫飞行高峰期（约 7 月 5 日）进行，第二次喷洒应在 10 天后进行。当地的处理方案应根据当地德克斯特茎蛀虫成虫出现的模式制定。59 米（195 英尺）宽的处理空中带不足以防止再次侵染，但 24 公顷（60 英亩）的处理半圆形带成功降低了大豆中的德克斯特茎蛀虫侵染。成虫的扫网样本未能成功确定处理阈值，因此处理决策将需要基于侵染的田间历史。需要进一步研究以确定更好的采样方法，这些方法可以用来建立处理阈值，并细化最佳处理时机。
