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Preliminary laboratory studies have shown the presence of pheromones of Leucinodes orbonalis , the brinjal shoot and pod borer found in Sri Lapka. Bioassay using an olfactometer revealed that the virgin female of L. orbonalis produces a sex pheromone which elicit highest response during the f i s t night. It was also shown that the pheromone production was discontinuous, the maximum production being around 22 : 00-24 :00 hours. Chemical investigations of the pheromone gland contents of callingdoi:10.4038/jnsfsr.v17i2.8218 fatcat:brr33xeoofexjkrf3autf5crly