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室内条件下,研究了不同浓度毒死蜱微球和毒死蜱乳油在水中的消解动态及其对白纹伊蚊Aedes albopictus 3龄幼虫的持续毒杀作用。结果表明:毒死蜱微球在水中的消解速率比乳油慢,半衰期比乳油的长,高浓度微球和乳油的消解半衰期均长于低浓度下的消解半衰期。有效成分为1.2、12和24 mg/L的毒死蜱微球和毒死蜱乳油在水中的消解半衰期分别为(19.4±2.1)d、(27.8±1.6)d、(31.0±1.7)d和(12.8±1.0)d、(16.1±0.9)d、(19.7±1.1)d;毒死蜱微球对白纹伊蚊3龄幼虫的毒杀作用强于乳油且持效期长,1.2 mg/L的毒死蜱微球水解85 d后处理白纹伊蚊3龄幼虫的死亡率高达76.6%,高于相同浓度、相同条件乳油的处理(53.3%),具有良好的持效性。
The indoor digestion dynamics of chlorpyrifos microspheres with different concentrations of chlorpyrifos and chlorpyrifos were studied in water and their sustained toxic effects on 3rd instar larvae of Aedes albopictus were studied. The results showed that the digestion rate of chlorpyrifos microspheres in water was slower than EC and the half-life was longer than that of EC. The digestion half-lives of microspheres and EC were both longer than those at low concentrations. The half-lives of chlorpyrifos microspheres and chlorpyrifos emulsified in water at the effective concentrations of 1.2, 12 and 24 mg / L were (19.4 ± 2.1) days, (27.8 ± 1.6) days, (31.0 ± 1.7) days and (12.8 ± 1.0 days) ), d (16.1 ± 0.9) d, (19.7 ± 1.1) d respectively. The toxicity of chlorpyrifos microspheres to 3rd instar larvae of Aedes albopictus was stronger than that of EC, The mortality of 3rd instar larvae of Aedes albopictus after d treatment was as high as 76.6%, which was higher than that of the same concentration of EC (53.3%).