Abstract An experiment was conducted at the Delta Research and Extension Center in Stoneville, MS during 2017 and 2018 to determine whether removal of the flood is an economical method of control for rice water weevil, Lissorhoptrus oryzophilus Kuschel. This experiment compared a continuous flood production system to draining a rice field completely and reestablishing a flood for the remainder of the growing season. In addition, two insecticide seed treatments, thiamethoxam and chlorantraniliprole, were compared with an untreated control within each system. Rice water weevil densities were measured prior to draining at 3 wk after flood and again after the flood was reestablished in drained plots. Rice water weevil densities were greater in 2017 than 2018. Chlorantraniliprole at the predrainage and postdrainage sample timing reduced larval numbers compared with the untreated control. The plots where water was removed until soil cracking then re-flooded had significantly lower weevil populations than plots that were continuously flooded during 2018 only. Draining of plots resulted in lower yields in 2018, but not in 2017. Additionally, both of the insecticide seed treatments resulted in greater yields and economic returns than the untreated control. Draining of flooded rice when rice water weevil larvae were present did not provide a consistent benefit, and may result in yield and economic penalties. Insecticide seed treatments consistently provided greater yield benefits in flooded rice. Based on these results, draining of flooded rice is not recommended to manage rice water weevil and insecticide seed treatments should be used to minimize economic losses.

中文翻译：

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稻水象甲（鞘翅目：仙茅科）幼虫防治结合杀虫剂种子处理除洪评价

摘要 2017 年和 2018 年在马萨诸塞州斯通维尔的三角洲研究和推广中心进行了一项实验，以确定清除洪水是否是控制稻水象甲 Lissorhoptrus oryzophilus Kuschel 的经济方法。该实验将连续洪水生产系统与完全排干稻田并在剩余的生长季节重建洪水进行了比较。此外，将两种杀虫剂种子处理剂噻虫嗪和氯虫苯甲酰胺与每个系统内的未处理对照进行了比较。稻水象鼻虫密度在洪水后 3 周排水前和在排水地块中重新建立洪水后再次测量。2017 年的稻水象鼻虫密度高于 2018 年。与未处理的对照相比，在排水前和排水后采样时间的氯虫苯甲酰胺减少了幼虫数量。与仅在 2018 年持续被洪水淹没的地块相比，在土壤开裂后重新淹水的地块的象鼻虫种群数量明显减少。地块排水导致 2018 年产量下降，但 2017 年没有。此外，两种杀虫剂种子处理比未经处理的对照产生更高的产量和经济回报。当存在稻水象鼻虫幼虫时，将淹水的稻米排水并不能提供一致的益处，并可能导致产量和经济损失。杀虫剂种子处理始终为淹水水稻提供更大的产量效益。基于这些结果，