Bioassays were carried out in order to assess the insecticidal value of the neonicotinoid thiamethoxam in different concentrations against seven important beetle species that are major pests of stored grains. These species were Prostephanus truncatus (Horn), Rhyzopertha dominica (F.), Sitophilus oryzae (L.), Sitophilus granarius (L.), Oryzaephilus surinamensis (L.), Tribolium confusum Jacquelin du Val, and Cryptolestes ferrugineus (Stephens). Adults of these species were exposed to grains treated with thiamethoxam at dose rates of 0 (control), 0.01, 0.1, 0.5, 1, 2, 5 or 10 ppm. Our results indicate that with the increase of the insecticide concentration, there was also an increased adult mortality and a reduction in progeny production. To illustrate the relative sensitivity to thiamethoxam of the seven insects, starting with the most susceptible, we can classify them as P. truncatus > R. dominica = S. granarius = S. oryzae > T. confusum = O. surinamensis > C. ferrugineus. The findings of the present research show that thiamethoxam can be recommended for its efficacy at a rate of 10 ppm and duration of 14 days that could be used to control all insects and their progeny.

进行生物测定以评估不同浓度的新烟碱类噻虫嗪对七种重要甲虫物种的杀虫价值，这些甲虫物种是储存谷物的主要害虫。这些物种是Prostephanus truncatus (Horn)、Rhyzopertha dominica (F.)、Sitophilus oryzae (L.)、Sitophilus granarius (L.)、Oryzaephilus surinamensis (L.)、Tribolium confusum Jacquelin du Val 和Cryptolestes ferrugineus（斯蒂芬斯）。这些物种的成虫暴露于用 0（对照）、0.01、0.1、0.5、1、2、5 或 10 ppm 剂量率的噻虫嗪处理的谷物中。我们的结果表明，随着杀虫剂浓度的增加，成虫死亡率也增加，后代产量减少。为了说明七种昆虫对噻虫嗪的相对敏感性，从最敏感的开始，我们可以将它们分类为P. truncatus > R. dominica = S. granarius = S. oryzae > T. confusum = O. surinamensis > C. ferrugineus . 本研究的结果表明，可以推荐噻虫嗪的效力为 10 ppm，持续时间为 14 天，可用于控制所有昆虫及其后代。