常规白蚁预防药物对黄胸散白蚁的毒杀效果

Toxicity of conventional termiticides to Reticulitermes flaviceps

目的研究20%天鹰杀白蚁乳油、5%联苯菊酯悬浮剂、15%万洁杀白蚁乳油和48%毒死蜱乳油对黄胸散白蚁的毒杀和驱避效果,为控制房屋建筑白蚁提供理论依据。方法采用滤纸药膜法、毒土法和毒土柱法测定4种白蚁预防药剂对黄胸散白蚁的毒性和驱避性。结果供试的4种药物中,对黄胸散白蚁的毒杀效果以48%毒死蜱乳油和5%联苯菊酯悬浮剂最好,与200mg/L药液处理滤纸接触30min,48h后死亡率达100%;其次为20%天鹰杀白蚁乳油,在处理后第11天死亡率也达到100%;万洁杀白蚁乳油对白蚁的毒性较低,处理11d后的死亡率只有46.7%。用≥20mg/L的药液处理土壤时,处理后1～8d内,4种药物均可使与毒土接触的黄胸散白蚁全部死亡;药液浓度≥200mg/L时,黄胸散白蚁不能穿透5cm厚的毒土层。结论供试的4种药物均可用于白蚁预防。但综合而言,生产上仍以应用20%天鹰杀白蚁乳油为佳。

Objective To evaluate the toxicity and repellent effects of 20% Tianying termiticidal emulsifiable concentrates,5% bifenthrin suspension concentrates,15% Wanjie termiticidal emulsifiable concentrates and 48% chlorpyrifos emulsifiable concentrates to Reticulitermes flaviceps,providing the basis for termite control.Methods The drug-impregnated filter method,toxic soil method and toxic soil pillar method were used to determine the toxicity and repellent effects of the four agents against R.flaviceps.Results Among the four tested agents,48% chlorpyrifos emulsifiable concentrates and 5% bifenthrin suspension concentrates had the greatest contact toxicity to R.flaviceps.After 30 min of exposure to filters impregnated with 200 mg/L of them,the termite mortality reached 100% beyond 48 h.The second most toxic agent was 20% Tianying termiticidal emulsifiable concentrates,with 100% mortality beyond day 11 after treatment.The Wanjie termiticidal emulsifiable concentrates had the lowest toxicity to termites,with only 46.7% mortality beyond day 11 after treatment.All of the R.flaviceps in contact with the soil treated with ≥20 mg/L of any of the four agents died in 1 to 8 d.At a concentration of ≥200 mg/L,none of R.flaviceps could penetrate through a soil layer of 5 cm in thickness.Conclusion All of the four tested drugs can be used for termite prevention.In general,however,20% Tianying termiticidal emulsifiable concentrates should be the agent of choice for the manufacturing industry.