Hassan Babar, Fitzgerald Chris
Department of Agriculture and Fisheries, 50 Evans Road, Salisbury, QLD 4107, Australia.
Insects. 2023 Jun 4;14(6):522. doi: 10.3390/insects14060522.
The possibility of synergized pyrethrin-containing aerosol as a choice for spot-treating in Australia was investigated in laboratory tests. Topical toxicity tests, where pseudergates were subjected to multiple doses of pyrethrin mist insecticide, showed the concentration-dependent death of termites with a median lethal dose (LD) of 193.16 µg. Residual toxicity tests, where the termites were exposed to wood surfaces treated with pyrethrin-containing aerosol, showed a rapid mortality in short and continuous exposures. Less than 20% of the termites survived even when the termites were exposed to a treated wood surface for a minute. All the termites died within 1-5 h in continuous exposure tests, depending on the age of the treated surface. In repellency tests, the termites tended to visit treated surfaces, causing an overall lower survival of the termites. The synergized pyrethrin-containing aerosol remained insufficiently volatile to produce the complete mortality of the termites even after 196 h when there was no contact with a treated surface. The number of termites that survived following the application of the synergized aerosol through a simulated wood gallery or silicon tubing with fecal pellets was also negligible, demonstrating the ability of the aerosol to penetrate through pellets and ultimately resulting in a distribution that is ideal for treatment in the termite galleries.
在实验室测试中，研究了含增效除虫菊酯气雾剂作为澳大利亚局部处理选择的可能性。在局部毒性试验中，将假工蚁暴露于多剂量的除虫菊酯喷雾杀虫剂中，结果显示白蚁的死亡具有浓度依赖性，半数致死剂量（LD）为193.16微克。在残留毒性试验中，将白蚁暴露于用含增效除虫菊酯气雾剂处理过的木材表面，结果显示在短期和持续暴露下白蚁迅速死亡。即使将白蚁暴露于处理过的木材表面一分钟，存活的白蚁也不到20%。在持续暴露试验中，所有白蚁在1至5小时内死亡，这取决于处理过的表面的使用时长。在驱避试验中，白蚁倾向于光顾处理过的表面，导致白蚁的总体存活率较低。即使在与处理过的表面没有接触的情况下，经过196小时后，含增效除虫菊酯气雾剂的挥发性仍然不足，无法使白蚁全部死亡。通过模拟木通道或带有粪便颗粒的硅管施用增效气雾剂后存活的白蚁数量也可以忽略不计，这表明该气雾剂能够穿透颗粒，最终形成适合在白蚁通道中进行处理的分布。
