Kubota Shunichi, Shono Yoshinori, Matsunaga Tadahiro, Tsunoda Kunio
Agricultural Chemicals Research Laboratory, Sumitomo Chemical Co., Ltd, 2-1, Takatsukasa 4, Takarazuka, Hyogo, Japan.
Pest Manag Sci. 2007 Dec;63(12):1224-9. doi: 10.1002/ps.1442.
Treating soil with insecticides is thought to be an effective method for termite control. Speed of action and repellency of insecticides are important factors for discussing their barrier effects as soil-treatment termiticides. The chemical barrier effect of microencapsulated fenobucarb against Coptotermes formosanus Shiraki was examined in the laboratory.
Fenobucarb had a significantly faster lethal effect when applied to the mouthparts than to the tergites of worker termites. Soil that had been treated with > or = 50 mg kg(-1) of microencapsulated fenobucarb had a barrier effect within a single day, and could stop or retard the penetration of termites for 7 days. Microencapsulated fenobucarb did not act as a repellent, as indicated by a gradual increase in mortality at > or = 50 mg kg(-1) with slight penetration into the treated soil during the 7 day test.
The results suggest that microencapsulated fenobucarb is a fast-acting termiticide, with a good barrier effect as a soil treatment, that also acts as a reduced repellent, retarding entry of termites into treated soil.
用杀虫剂处理土壤被认为是控制白蚁的有效方法。杀虫剂的作用速度和驱避性是讨论其作为土壤处理白蚁防治剂的屏障效果的重要因素。在实验室中研究了微囊化仲丁威对台湾乳白蚁的化学屏障效果。
将仲丁威施用于工蚁的口器时，其致死效果明显快于施用于背板。用≥50 mg kg⁻¹微囊化仲丁威处理的土壤在一天内具有屏障效果，并且可以阻止或延缓白蚁穿透7天。微囊化仲丁威没有起到驱避作用，在7天的试验中，≥50 mg kg⁻¹时死亡率逐渐增加，且有少量白蚁穿透进入处理过的土壤。
结果表明，微囊化仲丁威是一种速效杀白蚁剂，作为土壤处理具有良好的屏障效果，也是一种驱避性降低的药剂，可延缓白蚁进入处理过的土壤。
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