Monocrotophos (60 %), a systemic organophosphate insecticide, was injected into the trunk of coconut palms of 8-10 m height and 20 years of age at the rate of 20.0 ml per palm. The residue levels of monocrotophos In coconut water and kernel a t various stages of nut development and different durations after application, measured by GLC, showed that the residues were below the tolerance limit of 0.2 ppm a t 14 days after trunk injection.