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There have been numerous reports on the morphogenetic cffects of many synthetic as well as naturally occurring substances on seyeral kinds ofinsects (SEHNAL and MEyER, 1968; BowERs, 1968; SRivAsTAvA and GiLBERT, 1968, 1969; SLAMA et al., 1968, 19691 WiGGLEswoRTH, 1969; JARoLtM et al., 1969s OHTAKi et al., 1971). Some of these substances have been shown to have juvenile hormone activitics toward a vari,ety of insccts and others only teward a limitcd number of species. Previously, we reported juvenile hormone activity of several new compounds, methyl farnesoate and methyl 10, 11-epoxy farnesoate with diffk rent alkyl groups, using two species of insects, 7-lenebrio motitor L. and 7S"ibotium castaneum HERBsT (MoRi, et al., 1971). Since the sensitivity of' insects to certain juvcnile hormone analogues has been known to depend on their taxonomical positions (SLAMA et al., 1970), several groups ef newly synt}ies{zed compounds, in addition te the previously tested compounds, were assayed in this study for each of thc three orders of insects, i. e,, Coleoptera, Lepidoptera and Hemiptera. The present paper concems two aspects; onc is the establishment of assay methods fbr the rice stem borer, C)hilo stigplessalis WALKER and the green rice leafi hopper, iVbPhotettix cincticops UHLER which are very important agricultural pests, and

applied entomology and zoology

Compounds with Juvenile Hormone Activity. I. Inhibitory Effects of the Synthetic Juvenile Hormone and Its Analogues on the Metamorphosis of Several Insects