Seiter Nicholas J, Del Pozo-Valdivia Alejandro I, Greene Jeremy K, Reay-Jones Francis P F, Roberts Phillip M, Reisig Dominic R
Department of Agricultural and Environmental Sciences, Clemson University, Edisto Research and Education Center, 64 Research Rd., Blackville, SC 29817. Present address: Division of Agriculture, University of Arkansas, Southeast Research and Extension Center, P.O. Box 3508, Monticello, AR 71656.
Department of Entomology, North Carolina State University, 100 Derieux Pl., 2301 Gardner Hall, Raleigh, NC 27695.
J Econ Entomol. 2015 Aug;108(4):1818-29. doi: 10.1093/jee/tov171. Epub 2015 Jun 26.
The kudzu bug, Megacopta cribraria (F.), first discovered in the United States in 2009, has rapidly become a pest of commercial soybean, Glycine max (L.) Merrill, throughout much of the southeast. Because of its recent arrival, management practices and recommendations are not well established. To develop action thresholds, we evaluated insecticide applications targeted at different densities of adults and nymphs determined using the standard 38-cm diameter sweep net sampling method in 12 soybean field trials conducted in Georgia, North Carolina, and South Carolina from 2011 to 2013. Average peak densities of M. cribraria in the untreated controls reached as high as 63.5 ± 11.0 adults per sweep and 34.7 ± 8.0 nymphs per sweep. Insecticide applications triggered at densities of one adult or nymph of M. cribraria per sweep, two adults or nymphs per sweep, and one adult or nymph per sweep, with nymphs present, resulted in no yield reductions in most cases compared with plots that were aggressively protected with multiple insecticide applications. A single insecticide application timed at the R3 or R4 soybean growth stages also resulted in yields that were equivalent to the aggressively protected plots. Typically, treatments (excluding the untreated control) that resulted in fewer applications were more cost-effective. These results suggest that a single insecticide application targeting nymphs was sufficient to prevent soybean yield reduction at the densities of M. cribraria that we observed.
葛藤蝽（Megacopta cribraria (F.)）于2009年首次在美国被发现，现已迅速成为美国东南部大部分地区商业种植大豆（Glycine max (L.) Merrill）的一种害虫。由于它是最近才出现的，其管理措施和建议尚未完善。为了制定防治指标，我们在2011年至2013年于佐治亚州、北卡罗来纳州和南卡罗来纳州进行的12次大豆田间试验中，使用标准的直径38厘米的扫网采样方法，评估了针对不同成虫和若虫密度的杀虫剂施用效果。未处理对照田中葛藤蝽的平均峰值密度高达每次扫网63.5 ± 11.0头成虫和34.7 ± 8.0头若虫。在每次扫网有1头成虫或若虫、2头成虫或若虫以及每次扫网有1头成虫或若虫（有若虫存在）的密度下施用杀虫剂，与多次施用杀虫剂大力防治的地块相比，在大多数情况下不会导致产量降低。在大豆生长的R3或R4阶段进行一次杀虫剂施用，其产量也与大力防治的地块相当。通常，施药次数较少的处理（不包括未处理对照）成本效益更高。这些结果表明，针对若虫进行一次杀虫剂施用就足以在我们观察到的葛藤蝽密度下防止大豆减产。
