Adams A, Gore J, Musser F, Cook D, Catchot A, Walker T, Dobbins C
Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, MS 39762 (
Delta Research and Extension Center (DREC), Mississippi State University, Stoneville, MS 38776 (
J Econ Entomol. 2016 Feb;109(1):200-6. doi: 10.1093/jee/tov310. Epub 2015 Nov 4.
Hybrid rice and insecticide seed treatments targeting rice water weevil, Lissorhoptrus oryzophilus Kuschel, have altered the landscape of rice production. The effect of reduced seeding rates on seed treatment efficacy in hybrid rice has not been studied. During 2011 and 2012, an experiment was conducted at seven locations to determine the relationship between low seeding rates used in hybrid rice and efficacy of selected insecticidal seed treatments as measured by rice water weevil densities and yield. Labeled rates of thiamethoxam, chlorantraniliprole, and clothianidin were compared with higher rates of these products to determine if labeled rates provide an acceptable level of control of the rice water weevil. Study locations were divided into low, moderate, and high groups based on rice water weevil larval densities. All seed treatments and seed treatment rates reduced rice water weevil densities. However, there was no observed yield or economic benefit from the use of an insecticidal seed treatment in areas of low pressure. Differences in yield were observed among seed treatments and seed treatment rates in moderate and high pressure locations, and all seed treatments yielded better than the untreated plots, but these differences were not always economical. All seed treatments showed an economic advantage in areas of high weevil pressure, and there were no differences among seed treatment products or rates, suggesting that currently labeled seed treatment rates in hybrid rice are effective for rice water weevil management.
针对稻水象甲（Lissorhoptrus oryzophilus Kuschel）的杂交水稻和杀虫剂种子处理改变了水稻生产格局。但尚未研究降低播种量对杂交水稻种子处理效果的影响。在2011年和2012年期间，在七个地点进行了一项试验，以确定杂交水稻中低播种量与所选杀虫剂种子处理效果之间的关系，该效果通过稻水象甲密度和产量来衡量。将噻虫嗪、氯虫苯甲酰胺和噻虫胺的标签推荐用量与这些产品的较高用量进行比较，以确定标签推荐用量是否能提供可接受的稻水象甲防治水平。根据稻水象甲幼虫密度，将研究地点分为低、中、高组。所有种子处理和种子处理用量均降低了稻水象甲密度。然而，在压力较低的地区，使用杀虫剂种子处理未观察到产量或经济效益的提升。在中等和高压力地区，不同种子处理和种子处理用量之间观察到产量差异，所有种子处理的产量均高于未处理地块，但这些差异并不总是具有经济效益。在象甲压力高的地区，所有种子处理均显示出经济优势，且种子处理产品或用量之间没有差异，这表明目前杂交水稻中标签推荐的种子处理用量对稻水象甲防治有效。
