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Received December 05, 1991,Revised , Accepted , Available online

Volume 4,1992,Pages 24-29

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The residue and persistence of the insect growth regulator 1-(2-(chlorobenzoyl)-3-(4-chlorophenyl)urga(CCU)in Chinese cabbage and soil in the field were studied in Northern China during 1988-1989.The degradation of CCU in soils was also studied under laboratory conditions.The CCU was found to be unstable in Chmese cabbage and soil in field.The half-life ofCCU was 13.2-14.0 days in Chinese cabbage and 8.8-27.0 days in soil,respectively.Three ppm as the maximum residue level for CCU in Chinese cabbage and 21 days as the preharvest interval for the vegetable treated with CCU were recommendced.

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