台湾乳白蚁和黄胸散白蚁对伊维菌素的敏感性差异

目的了解台湾乳白蚁和黄胸散白蚁对伊维菌素的敏感性差异,为伊维菌素用于白蚁防制提供依据。方法台湾乳白蚁和黄胸散白蚁与伊维菌素溶液处理的沙土接触或用伊维菌素处理的滤纸饲喂,观察白蚁的死亡情况。结果伊维菌素溶液处理的沙土对台湾乳白蚁和黄胸散白蚁具较高的毒性,其死亡速度和比例与处理浓度及处理时间有关,当浓度为0.00625mg/L时,第10天黄胸散白蚁和台湾乳白蚁的死亡率分别为90.00%和100%;当浓度为0.1mg/L时,24h内2种白蚁的死亡率均为100%。与黄胸散白蚁相比,台湾乳白蚁对伊维菌素的敏感性要高得多。结论伊维菌素对台湾乳白蚁和黄胸散白蚁有较强的毒杀能力和驱避活性,可用其开发处理土壤和木材的白蚁防治剂。

Difference of the susceptibility between Reticulitermes flaviceps and Coptotermes formosanus workers to ivermectin

Objective To test the susceptibility of Reticulitermes flaviceps and Coptotermes formosanus workers to ivermectin so as to provide basic information for termite control using ivermectin. Methods The workers of R.flaviceps and C.formosanus were exposed to soil or fed with filter papers treated with ivermectin, and then the dead was recorded every 24 hours. Results The sandy soil treated with ivermectin solution had high toxicity against the C.formosanus and R.flaviceps. The time from exposure to death and the mortality were positively related to the concentration of ivermectin solution and time of treatments. The mortalities of C.formosanus and R.flaviceps were 90.00% and 100%, respectively, at the 10th days after exposuring to sandy soil at 0.006 25 mg/L of ivermectin solution, while 100% and 100%, respectively, for 24 hours exposure to sandy soil at 0.1 mg/L of ivermectin solution. Compared to R.flaviceps, C.formosanus had higher susceptibility to ivermectin. Conclusion Ivermectin has stronger toxic capacity on the workers of R.flaviceps and C.formosanus. These suggest ivermectin could be used for termite control.