Lau K W, Chen C D, Lee H L, Sofian-Azirun M
Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
Medical Entomology Unit, WHO Collaborating Center for Vectors, Institute for Medical Research, Jalan Pahang, 50588 Kuala Lumpur, Malaysia.
Trop Biomed. 2015 Dec 1;32(4):684-692.
The residual activities of 5 insect growth regulators (IGRs) were studied and compared to operational dosage of temephos (1 mg/L) and Bacillus thuringiensis israelensis (Bti) (0.008 mg/L). The IGRs, temephos and Bti were applied into plastic containers containing 5 litres of water. Thirty Aedes aegypti larvae were added into each container weekly. Efficacy of these IGRs were evaluated for effective duration of each dosage and the percentage of emergence inhibition (EI). An end-point of EI/mortality ≥ 50% was considered to be effective. Pyriproxyfen possessed the longest residual activity in both indoor (43 weeks) and outdoor (26 weeks) conditions, followed by temephos (26 weeks in indoor and 16 weeks in outdoor). Although the residual activity of Bti in indoor lasted 8 weeks which was longer than cyromazine and diflubenzuron; however, it was least effective in outdoor which only lasted 2 weeks. This study revealed that pyriproxyfen possessed good residual effect among test IGRs compared to temephos and Bti. The use of IGRs can be an alternative long-term control measure in stagnant water body.
研究了5种昆虫生长调节剂（IGR）的残留活性，并与常用剂量的双硫磷（1毫克/升）和以色列芽孢杆菌（Bti）（0.008毫克/升）进行了比较。将IGR、双硫磷和Bti施用于装有5升水的塑料容器中。每周向每个容器中添加30只埃及伊蚊幼虫。评估了这些IGR的药效，观察每种剂量的有效持续时间和羽化抑制率（EI）。EI/死亡率≥50%的终点被认为是有效的。吡丙醚在室内（43周）和室外（26周）条件下具有最长的残留活性，其次是双硫磷（室内26周，室外16周）。虽然Bti在室内的残留活性持续8周，比环丙氨嗪和除虫脲长；然而，它在室外效果最差，仅持续2周。这项研究表明，与双硫磷和Bti相比，吡丙醚在测试的IGR中具有良好的残留效果。在静止水体中，使用IGR可以作为一种长期控制的替代措施。
