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Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (2): 61-67.doi: 10.11924/j.issn.1000-6850.casb15090067

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Contact Toxicity of Extracts of Eupatorium adenophorum Against Armyworm

Wang Yunmei, Fu Lihui, Huang Xiufen, Luo Xiaoling   

  1. (Agricultural Research Institute of Xichang Prefecture in Liangshan, Xichang Sichuan 615000)
  • Received:2015-09-16 Revised:2015-12-23 Accepted:2015-10-23 Online:2016-01-28 Published:2016-01-28

Abstract: In order to explore the effect of active ingredients from Eupatorium adenophorum on agricultural pests, contact toxicity of extracts of Eupatorium adenophorum against armyworm larvae was studied in this paper by dipping method. Then contact toxicity and development inhibition of methanol extracts of Eupatorium adenophorum at different concentrations to armyworm were analyzed. The results showed that there was certain contact toxicity of different concentration extracts from different parts of Eupatorium adenophorum against armyworm. The extract from flowers and leaves of Eupatorium adenophorum using methanol, acetone and petroleum ether as extraction agents had better contact toxicity to armyworm. Contact toxicity was enhanced with the increase of methanol extracts concentration and the increase of time, and LD50 at 24, 48 and 72 h was 15.27, 11.41 and 7.11 mg/mL, respectively.