Contact Lipaphis Activities of 20 Plant Extracts against erysimi Kaltenbach

• Published in: Plant Diseases and Pests(植物病虫害研究：英文版) Vol. 3; no. 5; pp. 14 - 15
• Main Author: Zhiyong DENG
• Format: Journal Article
• Language: English
• Published: 2012
• Subjects: 校正死亡率; 植物提取物; 毛细血管; 甲醇提取物; 白花蛇舌草; 萝卜蚜; 触杀作用; 触杀活性
• ISSN: 2152-3932

[Objective] The aim was to screen out plants which had strong contact activity against Lipaphis erysimi Kaltenbach. [Method] Twenty plant species which were collected from Gupo Mountain in Hezhou of China were extracted with methanol by cold soaking method. Contact activities of 20 methanol plant extracts against L. erysimi were determined by capillary micro spot method. [Result] The methanol extracts from Mussaenda esquirolli Levi. and Folium trematis Orientalis had the highest contact activities against L. erysimi at the dose of 10 p~g/head, and their 24 h corrected mortality rates were 92.22% and 92.15%, respectively; followed by Folium trematis and Viola hossei, with 24 h corrected mortality rate of 87.59% and 82.95%, respectively. The methanol extract of Hedyotis lancea had medium activity, with 24 h corrected mortality rate of 65.52%. Methanol extracts of the other plants had low contact activities against L. erysimi, with the corrected mortality rate lower than 50%. The methanol extracts of M. esquiroUi, F. variolosa and F. trematis had high contact toxicity, with LDS0 of 0. 768 6, 0.784 1 and 1. 504 4 μg/head, respectively. [ Conclusion] M. esquirolli, F. variolosa and F. trematis show exploitation potential, and they are worth further studying.