Bomzan Dikki Pedenla, Bhavya M L, Chandu A G S, Manivannan S, Lavanya G, Ramasamy K, Pasha Akmal
Food Protectants and Infestation Control Department, CSIR-Central Food Technological Research Institute, Mysore, 570 020 India.
J Food Sci Technol. 2018 Jun;55(6):2270-2278. doi: 10.1007/s13197-018-3144-8. Epub 2018 Apr 6.
The study was conducted to evaluate the synergistic effects of 2% pyrethrum extract with synthetic pyrethroids on the mortality of stored product insects. Contact toxicity was performed at variable concentrations observing mortality at 12, 24 and 48 h durations. The results of the present study indicated that, pyrethrum + deltamethrin combination (25:1 ratio) was effective on the adults of (F.) and (Herbst). On the other hand, pyrethrum + cypermethrin combination proved effective against (L.). The efficacy of the tested combination showed reasonable increase in mortality response in treated insects over increasing exposures. At 48 h, 450 ppm pyrethrum + deltamethrin combination induced 25, 90 and 97% mortalities in , and adults; while, pyrethrum-cypermethrin combination recorded 75, 45 and 75% mortalities respectively. On the other hand, it was observed that, among the pyrethrum alone treatments i.e. at 300, 450 and 600 ppm concentrations, maximum mortality (62.5%) was observed in exposed to 600 ppm pyrethrum for 48 h. The effective LC concentrations for pyrethrum (600 ppm) + deltamethrin combination was estimated to be as 0.1987 and 0.7039 µl/cm for and adults respectively. Contrastingly, for treatments with , a LC value of 0.8673 µl/cm was recorded for pyrethrum (600 ppm) + cypermethrin mixture. This investigation strengthens the fact that pyrethrum along with pyrethroids is effective against storage insect pests which can be promisingly a safer insecticidal combination.
本研究旨在评估2%除虫菊提取物与拟除虫菊酯类对仓储害虫死亡率的协同作用。在不同浓度下进行接触毒性试验，观察12、24和48小时的死亡率。本研究结果表明，除虫菊+溴氰菊酯组合（25:1比例）对赤拟谷盗（F.）和杂拟谷盗（Herbst）成虫有效。另一方面，除虫菊+氯氰菊酯组合对米象（L.）有效。测试组合的功效显示，随着暴露时间增加，处理昆虫的死亡率反应有合理增加。在48小时时，450 ppm除虫菊+溴氰菊酯组合在赤拟谷盗、杂拟谷盗和米象成虫中分别诱导了25%、90%和97%的死亡率；而除虫菊-氯氰菊酯组合分别记录了75%、45%和75%的死亡率。另一方面，观察到，在单独使用除虫菊的处理中，即在300、450和600 ppm浓度下，暴露于600 ppm除虫菊48小时的赤拟谷盗中观察到最高死亡率（62.5%）。除虫菊（600 ppm）+溴氰菊酯组合对赤拟谷盗和杂拟谷盗成虫的有效LC浓度估计分别为0.1987和0.7039 μl/cm。相比之下，对于米象的处理，除虫菊（600 ppm）+氯氰菊酯混合物的LC值记录为0.8673 μl/cm。这项调查强化了这样一个事实，即除虫菊与拟除虫菊酯类一起对仓储害虫有效，这有望成为一种更安全的杀虫组合。
