Adams A, Gore J, Musser F, Cook D, Catchot A, Walker T, Awuni G A
Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, MS 39762.
Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Delta Research and Extension Center (DREC), Mississippi State University, Stoneville, MS 38776.
J Econ Entomol. 2015 Jun;108(3):1079-85. doi: 10.1093/jee/tov095. Epub 2015 Apr 27.
Two experiments were conducted at the Delta Research and Extension Center in Stoneville, MS, during 2011 and 2012 to determine the impact of water management practices on the efficacy of insecticidal seed treatments targeting rice water weevil, Lissorhoptrus oryzophilus Kuschel. Larval densities and yield were compared for plots treated with labeled rates of thiamethoxam, chlorantraniliprole, and clothianidin and an untreated control. In the first experiment, plots were subjected to flood initiated at 6 and 8 wk after planting. Seed treatments significantly reduced larval densities with the 8-wk flood timing, but not the 6-wk flood timing. Overall, the treated plots yielded higher than the control plots. In the second experiment, the impact of multiple flushes on the efficacy of insecticidal seed treatments was evaluated. Plots were subjected to zero, one, or two flushes with water. All seed treatments reduced larval densities compared with the untreated control. Significantly fewer larvae were observed in plots that received one or two flushes compared with plots that did not receive a flush. All seed treatments resulted in higher yields compared to the untreated control in the zero and one flush treatments. When two flushes were applied, yield from the thiamethoxam and clothianidin treated plots was not significantly different from those of the control plots, while the chlorantraniliprole treated plots yielded significantly higher than the control. These data suggest that time from planting to flood did not impact the efficacy of seed treatments, but multiple flushes reduced the efficacy of thiamethoxam and clothianidin.
2011年和2012年期间，在密西西比州斯通维尔的三角洲研究与推广中心进行了两项试验，以确定水分管理措施对针对稻水象甲（Lissorhoptrus oryzophilus Kuschel）的杀虫种子处理效果的影响。比较了用噻虫嗪、氯虫苯甲酰胺和噻虫胺的标记剂量处理的地块以及未处理的对照地块的幼虫密度和产量。在第一个试验中，地块在种植后6周和8周开始淹水。种子处理在8周淹水时间时显著降低了幼虫密度，但在6周淹水时间时没有。总体而言，处理过的地块产量高于对照地块。在第二个试验中，评估了多次漫灌对杀虫种子处理效果的影响。地块进行零次、一次或两次漫灌。与未处理的对照相比，所有种子处理都降低了幼虫密度。与未进行漫灌的地块相比，接受一次或两次漫灌的地块中观察到的幼虫明显更少。在零次和一次漫灌处理中，所有种子处理的产量都高于未处理的对照。当进行两次漫灌时，噻虫嗪和噻虫胺处理地块的产量与对照地块没有显著差异，而氯虫苯甲酰胺处理地块的产量显著高于对照。这些数据表明，从种植到淹水的时间不会影响种子处理的效果，但多次漫灌会降低噻虫嗪和噻虫胺的效果。
