The persistence and the residual activity of four comercial organophosphorous termiticides, Chlorpyrifos, Fenitrothion, Tetrachlorvinphos, Pyridaphenthion, in soil were studied under laboratory conditions. The persistence and the residual activity of four organophosphorous termiticides in two types of soil decreased with the lapse of time. These termiticides were mostly degraded by microorganisms in the soil and these were degraded by cations such as Na, K, Cu(II) and Fe(II) in acetone-water mixed solution. The difference of persistence among types of formulation on degradation of Chlorpyrifos in soil were estimated under laboratory conditions. The following formulation were used. Soluble concentrate, Emulsifiable concentrate, Flowable concentrate, Microencapsulation and mixture with fungicide. The results suggested that the selection of suitable formulation of organophosphorous compound for the control of termites is important.

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