Evaluation acaricidal efficacy of botanical extract from Eupatorium adenophorum against the hard tick Haemaphysalis longicornis (Acari: Ixodidae)
文献类型： 外文期刊
作者： Nong, Xiang 1 ; Tan, Yong-Jian 1 ; Wang, Jia-Hai 1 ; Xie, Yue 1 ; Fang, Chun-Lin 3 ; Chen, Lin 1 ; Liu, Tian-Fei 4 ; Yang 1 ;
作者机构： 1.Sichuan Agr Univ, Coll Vet Med, Dept Parasitol, Yaan 625014, Peoples R China
2.Leshan Normal Univ, Coll Life Sci, Leshan 614004, Peoples R China
3.Sichuan Engn Res Ctr New Vet Drug, Chengdu 611130, Peoples R China
4.Guangdong Acad Agr Sci, Inst Anim Sci, Guangzhou 510640, Peoples R China
5.Sichuan Agr Univ, Coll Life & Basic Sci, Yaan 625014, Peoples R China
关键词： Hematophagy;Haemaphysalis longicornis;Eupatorium adenophorum;Acaricidal activity
期刊名称：EXPERIMENTAL PARASITOLOGY （ 影响因子：2.011； 五年影响因子：2.132 ）
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收录情况： SCI
摘要： The aim of this study was to evaluate the acaricidal activity of a botanical extract from Eupatorium adenophorum against the hard tick Haemaphysalis longicornis. This could result in developing effective extracts of E. adenophorum as a source of natural, low-toxicity plant-based acaricidal drugs. Adult engorged females of H. longicornis were collected from naturally infected goats. The engorged females were reared in the laboratory and their offspring (larvae and nymphs) were used as test ectoparasites. The toxic effects of botanical extracts from E. adenophorum against larvae and nymphs of H. longicornis were evaluated. The results showed that the extracts with 1.5 and 1.0 g/ml (w/v) concentrations were toxic for H. longicornis, comparable to a toxic effect of 2% chlorpyrifos (positive control). The median lethal time (LT50) for larval and nymphal ticks with 1.5 g/ml (w/v) concentration of extract were 0.790 (LT99 = 1.065) and 1.018 (LT99 = 10.608) hours, respectively, whereas the LT50 of 1.0 g/ml (w/v) concentration were 1.445 (LT99 = 6.047) and 1.313 (LT99 = 29.932) hours for larval and nymphal ticks, respectively. At a concentration of 1.5 g/ml (w/v), an acaricidal effect of 100% was achieved for both larval and nymphal ticks, while a concentration of 1.0 g/ml (w/v) resulted in 100% (for larvae) and 93% (for nymphs) within a 6 h period. In additional, we found that the relatively low concentration (0.5 g/ml) also obtained a good acaricidal effect during the short experimental period, with 2.22 and 2.651 h LT50 for larval and nymphal ticks, respectively. These results indicate that E. adenophorum contains potent acaricidal ingredients against the hard tick H. longicornis.
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