Sayed Samy M, Alotaibi Saqer S, Gaber Nevien, Elarrnaouty Sayed-Ashraf
Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza 12613, Egypt.
Department of Biotechnology, Faculty of Science, Taif University, Taif 888, Saudi Arabia.
Insects. 2020 Jun 26;11(6):398. doi: 10.3390/insects11060398.
Botanical insecticides that degrade rapidly are safer than persistent synthetic chemical insecticides, less harmful to the environment, decrease production costs and are not likely to cause insecticide resistance among pests. This study aimed to evaluate the effect of five different botanical extracts on the bean aphid, and the 2nd larval instar of the green lacewing, under laboratory conditions. Also, the flavonoids in the methanolic extracts of these tested plants were detected using HPLC analysis. The data from the HPLC analysis indicated that the tested plants differed in their flavonoid components. The total flavonoids were 869.4, 1125.6, 721.4, 1667.8 and 2025.9 mg/kg in , , , and , respectively. Moreover, there were many variations among these plants in the amount of each compound. The lethal concentration (LC) value of extract on aphids was the lowest among all of the plants (128.546 µg/mL) followed by (626.461 µg/mL). Also, the LC value of extract on the 2nd larval instar of (232.095 µg/mL) was significantly lower than those of all other four plant species extracts, while the other four plants did not show significant differences among them according to relative median potency analyses. Accordingly, extract had a strong effect on aphids and was safest for the predator. This finding suggests that could be exploited and further developed as an effective plant extract-based insecticide to be utilized in integrated pest management (IPM) programs against .
降解迅速的植物源杀虫剂比持久性合成化学杀虫剂更安全，对环境危害更小，能降低生产成本，且不太可能导致害虫产生抗药性。本研究旨在评估五种不同植物提取物在实验室条件下对豆蚜和草蛉二龄幼虫的影响。此外，还使用高效液相色谱分析检测了这些受试植物甲醇提取物中的黄酮类化合物。高效液相色谱分析的数据表明，受试植物的黄酮类成分存在差异。在[植物名称1]、[植物名称2]、[植物名称3]、[植物名称4]和[植物名称5]中，总黄酮含量分别为869.4、1125.6、721.4、1667.8和2025.9毫克/千克。此外，这些植物中每种化合物的含量也存在许多差异。[植物名称1]提取物对蚜虫的致死浓度（LC）值在所有植物中最低（128.546微克/毫升），其次是[植物名称2]（626.461微克/毫升）。同样，[植物名称3]提取物对草蛉二龄幼虫的LC值（232.095微克/毫升）显著低于其他四种植物提取物，而根据相对中位效力分析，其他四种植物之间没有显著差异。因此，[植物名称3]提取物对蚜虫有很强的作用，对捕食者最安全。这一发现表明，[植物名称3]可以作为一种有效的植物源杀虫剂进行开发和进一步利用，用于针对[害虫名称]的综合害虫管理（IPM）计划。
