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- W2377438649 abstract "The extracts of ethyl acetate,ethyl ether and petroleum ether were obtained from Cichorium intybus L.leaf by combined method of cold-soaking and ultrasonic extraction.And effects of three extracts on growth and development and anti-feeding of Mythimna separata Walker were studied by feeding-weighting and leaf-disc methods.The results show that the extraction rate of ethyl acetate extract from C.intybus leaf is significantly higher than that of ethyl ether and petroleum ether extracts,and their extraction rate is 4.36%,1.96% and 1.08%,respectively.During the experiment period of nine days,the individual weight of larvae in three extract treatment groups is significantly lower than that of the control(P0.05),and there are significant differences among three treatment groups generally.In which,the individual weight of larvae in treatment group with ethyl acetate extract is the lowest,and the development inhibition rate is the highest and continuously increases with prolonging of feeding time,which reaches to a rate of 79.27% in the ninth day of the experiment.While,the development inhibition rate in treatment groups with ethyl ether and petroleum ether extracts appears the trend of first enhancing and then reducing,both reach the highest rate of 62.44% and 45.83% respectively in the fifth day of the experiment.The mortality and weight per pupa of larvae in three treatment groups all are significantly higher than those of the control,but the pupation rate(50.00%-80.00%) is lower than that of the control.Among three treatment groups,the mortality and corrected mortality of larvae in the treatment group with ethyl acetate extract all are the highest with the values of 57.80% and 52.05%,respectively.The larval time of M.separata in three treatment groups has a significant difference with that of the control,and is longer for 3.62-11.78 d than that of the control.The anti-feeding effect on larvae in three treatment groups is significantly higher than that of the control,in which,the anti-feeding rate in the treatment group with ethyl acetate extract is the highest,and that in the treatment groups with ethyl acetate,ethyl ether and petroleum ether extracts treated for 72 h is 84.43%,76.46% and 16.67%,respectively.It is suggested that ethyl acetate,ethyl ether and petroleum ether extracts from C.intybus leaf have some effects of lethal and inhibit growth and development on M.separata larvae,especially,the bioactivity of ethyl acetate extract is stronger.Therefore,C.intybus leaf extracts can be exploited and utilized as natural botanical insecticide." @default.
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- W2377438649 date "2010-01-01" @default.
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- W2377438649 title "Bioactivity of different solvent extracts from Cichorium intybus leaf on Mythimna separata." @default.
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