【摘要】 本文报道灭幼脲Ⅲ号杀虫剂在大白菜和土壤中的残留试验结果.经在南北两地连续两年的田间试验表明,灭幼脲Ⅲ号属非持久性农药,在作物和土壤中都较快地消失,在大白菜上的半衰期为3.8—14.0d,在土壤中为8.8—27.0d.用25％灭幼脲Ⅲ号胶悬剂稀释2500倍,每亩每次按常规用药10g或加倍药量20g(有效成分)施药,喷施2或3次,距最后一次施药三周时,灭幼脲Ⅲ号杀虫剂在大白菜的最大残留量为2.67ppm,在土壤中为13.81ppm.建议该农药在大白菜上的最高允许残留量(MRL)为3ppm,安全间隔期为21d.更多还原

【Abstract】 A study on the residues and persis tence of insecticide l-(4-chlorophenyl)-3(2-chlorobenzoyl) urea (CCU), a chitinsynthetase inhibitor, in Chinese cabbage and soil was carried out in northern and southern China during 1988 and 1989, respectively. The results in the study indicated that CCU could break down easily in plant and soil. The half-life values for CCU was 3.8-14.0 days in Chinese cabbage and 8.8-27.0 days in soil. The maximum level of CCU residues was 2.67 ppm in Chinese cabbage and 13.81 ppm in soil 21 days after’the last application of the pestiside at the application rates of 150 or 300g a. i./hectare and with application frequencies of 2, or 3. 3pprn as the maximum residues level for CCU in Chinese cabbage and 21 days as the safety interval for the vegetable treated with CCU were recommended.更多还原