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• W2371304435 abstract "The aim of this study was to evaluate the repellent activity and contact toxicity of ethanolic extracts from non-host plant species against the brown planthopper(BPH), Nilaparvata lugens. We prepared ethanolic extracts from 11 plant species widely distributed in southern China, and tested their effects on BPH stage 3~4 nymphs using a film bioassay. The results showed that the extracts from Zanthoxylum bungeanum and Foeniculum vulgare had anti-feeding activity against BPH nymphs at a concentration of 10 mg·mL-1. These Z. bungeanum and F. vulgare extracts also had repellent activity, with repellent rates of 53.3% and 43.3%, respectively, at 24 h after extract application. In contrast, the extracts from Khaya senegalensis, Ageratum conyzoides, Eucalyptus exserta, and Chukrasia tabularis showed attractant activity at a concentration of 10 mg·mL-1; we recorded landing rates of 75.0%, 73.3%, 73.3% and 71.7%, respectively, at 24 h after extract application. Furthermore, the repellent activity of Z. bungeanum and F. vulgare extracts increased as the concentration increased. For example, these extracts at a concentration of 40 mg·mL-1 showed 66.7% and 60.0% repellent rates, respectively, at 24 h after extract application. The extracts from Z. bungeanum and F. vulgare showed significant repellent activity in the concentration range of 10~40 mg·mL-1. The attractant activity of extracts from K. senegalensis, A. conyzoides, E. exserta, and C. tabularis increased at relatively low concentrations, but decreased as the concentration of the extract became higher. The effects of ethanolic extracts from K. senegalensis and C. tabularis on BPH nymphs were different at different concentrations; at a low concentration(10 mg·mL-1), they showed significant attractant activity to BPH nymphs, while at a high concentration(40 mg·mL-1), they showed repellant activities of 50.0% and 40.0%, respectively, at 24 h after extract application. The extract from A. conyzoides had a significant attractant activity at 5 and 10 mg·mL-1, with landing rates of 71.7% and 73.3%, respectively, at 24 h after extract application. The extract from E. exserta had a significant attractant activity at 10 and 20 mg·mL-1, with landing rates of 73.3% and 71.7%, respectively, at 24 h after extract application. The extracts from Capsicum annuum, F. vulgare, Z. bungeanum, A. conyzoides and Bidens pilosa showed significant contact toxicity, the corrected mortality rates were higher than 85% at 95.69 μg·cm-2 after 24 h; the LD50 of these five plant extracts to BPH nymphs were 15.46, 25.66, 33.61, 33.57 and 37.85 μg·cm-2, respectively. The extracts from K. senegalensis and Wedelia chinensis also showed contact toxicity, the corrected mortality rates were higher than 50% at 95.69 μg·cm-2 after 24 h. The 11 non-host plant species were in different families and genera, and showed different repellent activities to BPH nymphs depending on the concentration of the ethanolic extract. The extracts from C. annuum, F. vulgare, Z. bungeanum, A. conyzoides, and B. pilosa showed significant contact toxicity. C. annuum, F. vulgare, and Z. bungeanum are crop species. The results of this study suggest that these three crops have the potential for the development of bio-pesticides. A. conyzoides and B. pilosa are abundant, easy to collect, and widely distributed in southern China. Therefore, these two species also have the potential for development as botanical insecticides." @default.
• W2371304435 created "2016-06-24" @default.
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• W2371304435 date "2014-01-01" @default.
• W2371304435 modified "2023-09-28" @default.
• W2371304435 title "Repellent activity and contact toxicity of ethanolic extracts from 11 non-host plant species against the brown planthopper nymphs,Nilaparvata lugens" @default.
• W2371304435 hasPublicationYear "2014" @default.
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