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研究了20%敌畏·氰戊乳油在桃中的残留消解动态,并对其安全使用标准进行了讨论。结果表明,在桃生长的不同时期,应用20%敌畏·氰戊乳油以施药剂量200mg/L进行消解动态试验,敌敌畏的消解半衰期为1.0～1.3d,氰戊菊酯的消解半衰期为4.1～4.6d。最终残留试验表明,按推荐剂量(100mg/L)和高剂量(200mg/L)使用2次和3次,在桃收获前7d或14d,敌敌畏残留量为未检出(<0.01mg/kg)～0.023mg/kg,氰戊菊酯残留量为0.010～0.066mg/kg。综合多方面因素,建议20%敌畏·氰戊乳油在桃上按推荐剂量(100mg/L)喷雾使用,最多使用2次,安全间隔期不小于7d,MRL推荐值为敌敌畏0.2mg/kg,氰戊菊酯为0.2mg/kg。
The residual digestion dynamics of 20% dichlorvos and cyphenemet in peach was studied, and the criteria of its safe use were discussed. The results showed that the digestive dynamic test was carried out with 20% dichlorvos-cypoxide EC at a dose of 200 mg / L at different stages of peach growth. The digestion half-life of dichlorvos was 1.0-1.3 d and the digestion half-life of fenvalerate was 4.1 ~ 4.6d. The final residue test showed that dichlorvos residues were undetected (<0.01 mg / kg) at the recommended dose (100 mg / L) and the high dose (200 mg / L) ~ 0.023mg / kg, fenvalerate residues 0.010 ~ 0.066mg / kg. Based on a variety of factors, it is recommended that 20% dichlorvos-Cyanamnate be sprayed on the peach at the recommended dosage (100mg / L) for up to 2 times with a safety interval of at least 7 days. The recommended MRL is 0.2 mg / kg for dichlorvos, Fenvalerate 0.2mg / kg.