| Autor: |
Ragesh, Parekkat Ramachandran, Bhutia, Tenzin Nyibum, Ganta, Satish, Singh, Ashok Kumar |
| Předmět: |
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| Zdroj: |
Archives of Phytopathology & Plant Protection; Jan-Feb2016, Vol. 49 Issue 1-4, p19-30, 12p |
| Abstrakt: |
Repellent, antifeedant and toxic effect of crude hexane extract ofAgeratum conyzoideswere investigated againstHelicoverpa armigera. In orientation bioassay, the extract exhibited dose-dependent repellency against neonates. Extract significantly increased the mortality and decreased growth of different larval stages when administrated orally in artificial diet. EC50value was at 0.11% for larval growth inhibition. Toxicity of the extract was manifested by high mortality of first instar larvae after 7 days of feeding on diet containing 0.05–0.4% of extract with LC50of 0.17%. Under choice bioassay, extract showed strong antifeedant activity against fifth instar larvae with DI50of 0.21%. In nutritional bioassay, extract significantly reduced RCR, RGR, ECI and ECD of fifth instar larvae with increased AD. When RGR were plotted against RCR, the growth efficiency of larvae fed on treated diet was significantly lower than the control fed larvae suggesting the antifeedant and toxic effect of extract. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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