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Received March 02, 1992,Revised , Accepted , Available online

Volume 4,1992,Pages 87-96

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Degradation,adsorption and field fate of pesticide Dhnehypo have been investigated.The results are as follows:hydrolysis of Dimehypo is very slow under pH range of 3 to 9.Degradation of Dimehypo in soil is mainly microorganism-related.Furthermore,Dimehypo and Nereistoxin can be rapidly degraded under ultraviolet light.Adsorption of Dimehypo by soil is negligible,while Nereistoxin can be sorbed‘o a large extent.After foliar spray in the rice field。distribution of Dimehypo concentration has the following sequence:crop>field water>soil.Field trials have proved considerable tendency of pesticide to leach down the profile,particular attention should be paid to threats of Dimehypo posed to the groundwater.

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