Extraction and separation of active ingredients from Laggera pterodonta against locusts

Abstract:

In order to discover new active compounds from poisonous plants for the research and development of botanical pesticides,the insecticidal activities of ethanol extracts from six poisonous plants against aphids were determined by dipping leaf method. The results showed that the corrected mortality rates of ethanol extracts from Laggera pterodonta against aphids at 2000 mg/L, 5000 mg/L and 10000 mg/L were 76.83 %, 92.85 %, and 100 %, respectively. And the insecticidal activities of ethanol extracts from six poisonous plants against locusts were determined by dipping leaf and insect method. The results showed that the corrected mortality rate of ethanol extracts from Laggera pterodonta reached 72.00 % at 10000 mg/L for 120 h, and the active ingredients of Laggera pterodonta against locusts were determined by the bioassayguided method. After separation and purification, compound 1 with better activity was obtained. Its corrected mortality against Locusts was 67.86 % at 1000 mg/L for 72 h, which provided a theoretical basis for further study on the insecticidal active ingredients from Laggera pterodonta.