The sex pheromone of the Rice stem borer, Chilo sappressalis WALKER (Lepidptera: Pyralidae), (Z)-11-Hexadecenal, was biosynthesized by feeding experiments with possible deuterized precursors and tested by a GC-SIM analysis of the pheromone component. The pathway commenced by hexadecanoic acid being reduced to the hexadecanal, from which (Z)-11-hexadecenal was biosynthesized by the introduction of a double bond.

The sex pheromone of the pine moth Dendrolimus spectabilis Butler was tentatively identified as 5,7-dodecadien-l-ol by the use of the electroantennogram technique. Analyses of abdominal tip extracts of virgin females by gas-liquid chromatography and mass spectroscopy showed the presence of a (5Z, 7E)-isomer and a (5E, 7E)-isomer in the ratio of about ca. 5:1. In field examinations with four synthetic isomers of 5,7-dodecadien-l-ol, only traps baited with the (5Z, 7E)-isomer captured an appreciable numbers of male moths.

The sex pheromone of the rice green caterpillar, Naranga aenescens Moor, was presumed to be a mixture of some unsaturated acetates using electroantennogram technique. Abdominal tips of virgin females were shown to contain (Z)-9-tetradecenyl acetate (compound I), (Z)-9-hexadecenyl acetate (compound 11) and (Z)-11-hexadecenyl acetate (compound III) in a ratio of 1:1:4, respectively. These synthetic three compounds were individually active on the male antenna but only the mixture of the three compounds attracted the male moths in a field. Field traps containing the three compounds in a ratio of 1:1:4 (1mg/rubber septum) consistently attracted more males than traps baited with two unmated females.