关键词: 钱塘江, 海塘, 白蚁, 药物灌浆, 20%天鹰杀白蚁乳油

Abstract: Objective To know the possibility of grout treatment with termiticides for the control of termites in seawall. Methods To detect the control efficiency of 20% fenvalerate EC to Coptotermes formosanus Shiraki by toxic soil contact method and toxic soil pillar method, and analyze the fenvalerate content of soil after treatment with termiticide grout by gas chromatography. Results The 20% fenvalerate EC had good control effect on the C.formosanus. C.formosanus could not pass through 5 cm thick of soil and would died completely within 5 days at the fenvalerate content of 5 μg/g in soil. The content of fenvalerate in soil near to the grout hole varied with the difference of sampling location affected by seawall soil structure. At the distance of 0.50 m, 0.75 m and 1.00 m away from the grout hole, the content of fenvalerate in the soil 1 meter near to the surface of ground were (26.08±23.40)μg/g, (15.33±14.53)μg/g and (11.84±12.81)μg/g, respectively. The length of tunnel built by termites in the soil mentioned above was (1.7±2.8) cm, (2.5±2.5) cm and (3.5±2.6) cm, respectively. Conclusion The grout treatment with termiticides could control effectively termites in seawall. However, because soil structure of seawall is different and fenvalerate in soil would gradually degrade, we suggest the management department of seawall utilizes the termite monitor-controlling system to monitor seawall, aiming to kill the invasive termites in time and insure the safety of seawall.