Repellents against thein the Japanese Cedar , Cryptomeria J ' aponica , Pill - bug , Armadinidium vuigare JSM
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چکیده
of arresting rate ± S.E.) had settled on the control filter paper. These results and observations made clear that the MeOH extract of C. japonica strongly disturbed the A. vuigare isopods and made them move to the filter paper containing only water, indicating that the extract contained a repellent(s) against the isopod species. The crude MeOH extract suspended in water was successively extracted with hexane, diethyl ether, ethyl acetate, and butanol. As shown in Fig, 1, only the diethyl ether-soluble fraction showed repellent
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NoteAntifeedants against Aeusta despesta Cryptomeria 1 ' aponica II fromthe Japanese Cedar , jSBA
± S.E.)6) was chromatographed on a silica gel colurnn to separate it into the 100% hexane, 20% AcOEtl hexane, 50% AcOEtlhexane and 100% AcOEt frs. The bioassay results clearly confirmed that the active component(s) in the original hexane fr. were concentrated in the 20% AcOEtfhexane fr. (92,4%± 1.6). The activities of the other frs. were as follows: 100% hexane fr. (O.O%± O.O), 50% AcOEt!hexane...
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