Ritchie Scott A, Long Sharron A, McCaffrey Nick, Key Christopher, Lonergan Greg, Williams Craig R
School of Public Health, Tropical Medicine and Rehabilitation Sciences, James Cook University, PO Box 6811, Cairns, Queensland 4870, Australia.
J Am Mosq Control Assoc. 2008 Mar;24(1):47-53. doi: 10.2987/5658.1.
Lethal ovitraps (LO) have been successfully deployed in dengue control operations in north Queensland, Australia since 2004. However, the current plastic-bucket LO must be retrieved before the pesticide-treated strip degrades and the trap begins producing mosquitoes. The logistics involved with trap retrieval are considerable and include recording trap location and retrieval date onto a database, locating and retrieving each trap, and examining lethal ovitraps for eggs. Collectively, these necessary activities greatly reduce the efficiency of dengue control. In response, we have developed a biodegradable lethal ovitrap (BLO) that does not need to be retrieved for the control of container-breeding Aedes, particularly Aedes aegypti. The BLOs were made by injection molding with the use of 2 proprietary blends of thermoplastic starch (TPS) polymer based on plasticised amylose maize polymers. In field trials, Ae. aegypti readily oviposited in BLOs, with those dyed black with the use of carbon black preferred. Water loss was higher in BLOs than in standard plastic LO because of weeping from the walls, although none of the BLOs failed in the 5 wk of the trial. The occurrence and rate of Ae. aegypti oviposition in both BLOs and the LO was comparable. In an accelerated standard composting trial (ISO16929:2002E), both BLOs fragmented within 4 wk, and no BLO particles were visible after 12 wk. Large numbers of BLOs could be deployed in a "set it and forget it" strategy to control Ae. aegypti and to stop dengue transmission, and could be used in a community participation program to maximize coverage.
自2004年以来，致死性诱蚊产卵器（LO）已成功应用于澳大利亚昆士兰州北部的登革热防控行动中。然而，当前的塑料桶式LO必须在经过杀虫剂处理的纸条降解且诱捕器开始产生蚊子之前收回。诱捕器回收涉及的后勤工作相当繁琐，包括将诱捕器位置和回收日期记录到数据库中、定位并回收每个诱捕器，以及检查致死性诱蚊产卵器中是否有卵。总体而言，这些必要活动大大降低了登革热防控的效率。作为应对措施，我们开发了一种可生物降解的致死性诱蚊产卵器（BLO），用于控制容器滋生的伊蚊，尤其是埃及伊蚊，无需进行回收。BLO通过注塑成型制成，使用了基于增塑直链淀粉玉米聚合物的两种热塑性淀粉（TPS）聚合物专有混合物。在田间试验中，埃及伊蚊很容易在BLO中产卵，其中使用炭黑染成黑色的更受青睐。由于BLO的壁有渗水现象，其水分流失比标准塑料LO更高，不过在为期5周的试验中，没有一个BLO失效。埃及伊蚊在BLO和LO中的产卵情况及比率相当。在一项加速标准堆肥试验（ISO16929:2002E）中，两种BLO在4周内均破碎，12周后已不见BLO颗粒。大量的BLO可以采用“设置后无需管”的策略来部署，以控制埃及伊蚊并阻止登革热传播，还可用于社区参与计划以实现最大覆盖范围。
