浏阳霉素对两种螨的室内毒力测定与田间防效

为评估浏阳霉素对柑橘全爪螨和棉二斑叶螨的毒杀活性,测定了该药剂对他们的生物活性。结果表明:浏阳霉素对柑橘全爪螨成螨的LC50值为0.19 mg/L,95%置信区间为0.13～0.45 mg/L,毒力回归方程为:y=0.978 31 x+2.863 7;浏阳霉素对棉二斑叶螨的LC50値为0.36 mg/L,95%置信区间为0.24～0.66 mg/L,毒力回归方程为:y=1.269 3 x+2.948 1;浏阳霉素使用浓度为2.00 mg/L时对柑橘全爪螨和棉二斑叶螨的螨卵有一定的杀伤力;当使用浓度为2.00 mg/L和1.00 mg/L时,处理36 h后对柑橘全爪螨和棉二斑叶螨具有较强的趋避作用。10%浏阳霉素EC使用量为30～40 mL/667m2,对柑橘全爪螨和棉二斑叶螨的防治效果最好,药后1～7 d防效分别达87.1%～95.5%和91.2%～94.4%。其效果与15%哒螨灵15 mL/667m2的效果相近。

Laboratory Toxicity Test and Field Control Effect of Liuyangmycin to Two Kinds of Acari

In order to evaluate acaricidal activities of Liuyangmycin against Panonychus citri and Tetranychus urticae Koch,the bioactivity of Liuyangmycin to them was determined.The results showed that the Liuyangmycin had exhibited acaricidal activity against the adult of Panonychus citri with the LC50 value of 0.19 mg/L,and its 95% confidence interval and the toxicity regressive equation were 0.13~0.45 mg/L and y=0.978 31 x+2.863 7,respectively;the Liuyangmycin also had possessed acaricidal activity against Tetrany...