CHa=CH--CHI PyrethrinI CH,--CHI CincrinI CHs-CHa--CHI Jasmolin I CHa=CH---COSCH, Pyrethrin I1 CH,--CO,CHs Cinerin I1 CHs-CHa--COpCHa Jasmolin I1 (a) natural esters (b) most active isomer in fenvalerate Figure 1 (a) TIte six natural esters; (6) a recent synthetic pyrethroid 2 DefinitionAlthough it is accepted that pyrethroids interfere with nerve action, the precise M. Elliott, in 'The Future for Insecticides: Needs and Prospects', ed. R. L. Metcalf and
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