Sugar Research Station, Louisiana State University Agricultural Center, St. Gabriel, LA.
Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA.
J Econ Entomol. 2020 Jun 6;113(3):1248-1253. doi: 10.1093/jee/toaa063.
The rice stink bug, Oebalus pugnax (F.), is the most important pest of headed rice, Oryza sativa L., in the United States. Numerous studies have attempted to quantify the impact of O. pugnax feeding on rice yield and grain quality, but these studies have often produced conflicting results. Across mid-south U.S. rice, thresholds based on sweep net sampling are used to determine the need for insecticide applications, but few studies have related sweep net captures to rice quality parameters. Field trials were conducted in Louisiana in 2015 and 2016 that used different rates of insecticides to establish rice plots with mean O. pugnax infestations ranging from 0.8 to 24.6 insects per 10 sweeps. Insecticide applications improved panicle weight and head yields as well as decreased percentage peck. A series of linear regressions examined relationships between O. pugnax captures and rice yield and quality parameters, including panicle weight, head yield (% whole kernels), and peck (discolored grains). Mean O. pugnax sweep net captures across all sampling dates in both years were significantly and negatively correlated to panicle weight and head yield and positively correlated to percentage peck. Peck was negatively correlated with head yield. Results from sampling at different maturity stages indicate sweep net captures at grain fill and soft dough stages had the greatest influence on rice yield and quality parameters, respectively. Further research into impacts of milling quality reductions on farm revenue and the influence of cumulative infestations over grain development is needed to improve economic thresholds for O. pugnax in rice.
稻绿蝽，Oebalus pugnax（F.），是美国最重要的水稻害虫，尤其危害水稻的头部。许多研究试图量化稻绿蝽取食对水稻产量和谷物质量的影响，但这些研究往往产生相互矛盾的结果。在美国中南部的水稻种植区，使用捕虫网抽样法来确定是否需要进行杀虫剂的应用，但是很少有研究将捕虫网的捕获量与水稻质量参数联系起来。2015 年和 2016 年在路易斯安那州进行的田间试验使用不同剂量的杀虫剂来建立平均稻绿蝽感染率从每 10 次捕虫网捕捉 0.8 到 24.6 只的水稻试验区。杀虫剂的应用提高了穗重和头产量，并降低了啄食率。一系列线性回归检验了稻绿蝽的捕获量与水稻产量和质量参数之间的关系，包括穗重、头产量（整粒百分比）和啄食（变色粒）。在这两年的所有采样日期，稻绿蝽的平均捕虫网捕获量与穗重和头产量呈显著负相关，与啄食率呈正相关。啄食率与头产量呈负相关。不同成熟阶段采样的结果表明，在灌浆期和软面团期进行的捕虫网采样分别对水稻产量和质量参数的影响最大。需要进一步研究稻米加工质量降低对农场收入的影响，以及在谷物发育过程中累计感染的影响，以提高稻绿蝽在水稻中的经济阈值。
