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目的 :观察生物杀螨剂阿维菌素在热带珊瑚岛上对地里纤恙螨成虫杀灭效果。方法 :室内试验采用浸液法和沙盆饲养喷药法 ,野外试验采用定区喷药法。结果 :1.8%阿维菌素LC50 为 0 .0 0 0 36 1,其 95 %可信限为0 .0 0 0 2 6 3～ 0 .0 0 0 496。选用 0 .0 0 18%和 0 .0 0 3 6 %两种浓度的阿维菌素进行地里纤恙螨成虫杀灭试验 ,室内沙盆饲养法药后 15d其校正死亡率分别为 85 .4%、90 .2 % ;野外现场试验其平均灭效分别为 80 .5 %、81.9%。结论 :阿维菌素在热带珊瑚岛上对地里纤恙螨成虫有很好的杀灭效果 ,建议用 0 .0 0 18%浓度进行滞留喷洒
OBJECTIVE: To observe the killing effect of abamectin, a biocidal acaricide, on adult chigger mites in the tropical coral island. Methods: The indoor test using immersion method and sand feeding spraying method, the field test using fixed area spraying method. Results: The LC50 of avermectin 1.8% was 0.000036 1, and its 95% confidence limit was 0.000026.3-0.04049. The avermectin concentrations of 0.018% and 0.03036% were chosen to kill the chigger mites adults. The corrected mortalities at the 15th day after oral administration of the sand molds were 85%. 4% and 90.2% respectively. The average off-field efficacy in field trials was 80.5% and 81.9% respectively. CONCLUSION: Abamectin has a good killing effect on adult chigger mites in the tropical coral island, and it is suggested to carry out retention spraying at the concentration of 0.018%