Interferential effects of five solvent extracts from Mikania micrantha on Nilaparvata lugens
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Key Words： different solvent extracts, Nilaparvata lugens, Mikania micrantha, deterrent effect
Abstract： The interferential effect of five solvent extracts from the plant Mikania micrantha on the Brown Planthopper (BPH), Nilapavata lugens Stol, was tested in a laboratory. The results indicate that chloroform and ethanol extracts were the best oviposition deterrents after 48 h, reducing oviposition by 86.44% and 83.90% respectively. Ethanol and ethyl acetate extracts were the best browse deterrents, reducing browsing by 74.19% and 51.86% respectively. All five solvent extracts were to some degree toxic to instars and adults. Ethanol, chloroform and ether extracts were most toxic to 1st and 2nd instars, however, ethyl acetate extract was more toxic to adults. Chloroform and ethanol extracts had the strongest effects on the experimental population of BPH having IIPCs (Interference index of population control) of 0.0428 and 0.0515 respectively. Considering bioactivity, extraction efficiency, price and toxicity, ethanol is the best organic solvent with which to extract active components from M. micrantha.