Department of Entomology, University of Arkansas, Lonoke Extension Center, Highway E., Lonoke, AR.
Department of Entomology, University of Arkansas, RREC, Hwy E, Stuttgart, AR.
J Econ Entomol. 2019 Dec 9;112(6):2713-2718. doi: 10.1093/jee/toz189.
The rice stink bug, Oebalus pugnax (F.), is a key pest of heading rice, Oryza sativa L. (Poales: Poaceae), in the southern United States. Sweep net sampling is the recommended method for sampling rice stink bug in rice, but there currently exists no specific recommendation for sweep length, and a large amount of variation likely exists amongst samplers. The objectives of this study were to determine the role that sweep length plays in sampling accuracy and determine the feasibility of using sweep lengths smaller than 180°. When monitoring sweep lengths by consultants, producers, and researchers, a large amount of variation in sweep length and a significant linear relationship between sweep length and rice stink bug catch per 10 sweeps was observed. Sweep length was then controlled at three levels (0.8, 1.8, and 3.5 m) and a change from 0.8 to 1.8 m in sweep length led to an increase on average of 2.28 rice stink bugs per 10 sweeps. These data suggest knowledge of sweep length is vital, and paired with large amounts of observed variation in sweep length, recommending a specific sweep length is ideal. Using Taylor's values, it was determined that 1.8 m sweeps resulted in density estimates that were as reliable as 3.5 m (180°) sweeps, suggesting a longer sweep length was not necessary. A 1.8 m sweep length recommendation would create an easier sampling regimen that is still reliable, which could lead to more accurate action threshold decisions being made for rice stink bug if it increases adoption in consultants and producers.
稻绿蝽，Oebalus pugnax (F.)，是美国南部水稻，Oryza sativa L. (禾本科：禾本科) 扬花期的主要害虫。扫网采样是在水稻中采样稻绿蝽的推荐方法，但目前没有具体推荐的扫网长度，采样者之间可能存在大量差异。本研究的目的是确定扫网长度在采样准确性中的作用，并确定使用小于 180°的扫网长度的可行性。当顾问、生产者和研究人员监测扫网长度时，观察到扫网长度存在大量差异，以及扫网长度与每 10 次扫网中稻绿蝽捕获量之间存在显著线性关系。然后将扫网长度控制在三个水平（0.8、1.8 和 3.5 m），扫网长度从 0.8 变为 1.8 m 平均导致每 10 次扫网中稻绿蝽增加 2.28 只。这些数据表明，了解扫网长度至关重要，并且结合大量观察到的扫网长度变化，推荐特定的扫网长度是理想的。使用泰勒值确定 1.8 m 的扫网产生的密度估计与 3.5 m（180°）的扫网一样可靠，这表明不需要更长的扫网长度。1.8 m 扫网长度的建议将创建一个更简单的采样方案，同时仍然可靠，如果它能提高顾问和生产者的采用率，这可能会导致对稻绿蝽的更准确的行动阈值决策。
