关键词: 伊维菌素, 白蚁, 毒性, 预防效果

Abstract: Objective To know the toxicity and control efficacy of 0.3% ivermectin EC against termites and to provide the theoretical basis for the application of this chemicals in practice.Methods The toxicity of 0.3% ivermectin EC to Coptotermes sp.and Reticulitermes sp.was tested by the filter paper containing chemicals and the control effect to termites was determined by the methods of wood block containing chemicals and application chemicals in soil.Results The results indicated that 0.3% ivermectin EC had strong toxicity to termites.The mortality rate of Coptotermes sp.andReticulitermes sp.ergate was 100% after continuous treatment with 100 mg/L ivermectin solution on the filter paper,however only the tested concentration reached 750 mg/L for Coptotermes sp.and 1500 mg/L for Reticulitermes sp.,these two termites were all dead after contact with filter paper for 30 min.The study also showed that Coptotermes sp.was more susceptibility to ivermectin than Reticulitermes sp.When ivermectin EC was applied in soil,50 mm thick soil treated with 350 mg/L concentration could completely prevent the penetration of termites in laboratory and more than 90% termites contacted with toxic soil would die.In the field,when 5 liter ivermectin solution was applied in one square meter soil,termites would penetrate the soil in the treated area within 12 months if the treated area was not covered by any-thing,and termites could not penetrate the soil treated with 1500 mg/L ivermectin solution within 12 months only if the treated area of soil was covered with a concrete slab.When the treated wood blocks were buried in the field soil,only wood blocks treated with 1500 mg/L ivermectin solution were not feed by termites within 12 months.Conclusion Though 0.3% ivermectin EC had high toxicity to termites,the concentration of application must reach 1500 mg/L if it was applied in soil or was used to treat the wood that contacted directly with wet soil to prevent the invasion of termites.