Table 2.
Results of the rapid bioassays of 10 commonly used insecticides against Musca domestica
| Insecticides | Mortality rates* | |||||
|---|---|---|---|---|---|---|
| Susceptible | Yuanlin (East) | Erlin (West) | Zhutang (South) | Changhua (North) | Xihu (Central) | |
| Cypermethrin | 100% (–) | 43% (+) | 31% (+) | 58% (+) | 70% (+) | 66% (+) |
| Tetramethrin | 100% (–) | 13% (+) | 3% (+) | 21% (+) | 5% (+) | 1% (+) |
| Permethrin | 100% (–) | 1% (+) | 5% (+) | 1% (+) | 3% (+) | 11% (+) |
| Deltamethrin | 100% (–) | 15% (+) | 13% (+) | 16% (+) | 15% (+) | 16% (+) |
| Chlorpyrifos | 100% (–) | 11% (+) | 1% (+) | 10% (+) | 60% (+) | 15% (+) |
| Fenitrothion | 100% (–) | 6% (+) | 1% (+) | 11% (+) | 13% (+) | 13% (+) |
| Pirimiphos-methyl | 100% (–) | 1% (+) | 5% (+) | 3% (+) | 10% (+) | 6% (+) |
| Propoxur | 100% (–) | 5% (+) | 8% (+) | 3% (+) | 13% (+) | 6% (+) |
| Fipronil | 100% (–) | 50% (+) | 51% (+) | 53% (+) | 65% (+) | 68% (+) |
| Imidacloprid | 100% (–) | 15% (+) | 3% (+) | 5% (+) | 8% (+) | 6% (+) |
*Mortality rates of 98–100%, 90–97%, and < 90% within 24 h indicate no resistance (–), possible resistance (±), and resistance (+), respectively