Table 4.
Per cent in vitro mortality of laboratory and field isolates of Dermanyssus gallinae exposed to spinosad
| Isolate | Concentration (ppm) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2.0 | 3.9 | 7.8 | 15.6 | 31.2 | 62.5 | 125 | 250 | 500 | 1000 | 2000 | 4000 | |
| Lab 1 | 4.1 | 6.1 | 5.5 | 6.2 | 1.8 | 7.0 | 14.2 | 10.8 | 9.2 | 27.2 | 63.7 | 92.5 |
| Lab 2 | 29.9 | 54.6 | 76.4 | 93.5 | ||||||||
| 2 | 43.2 | 55.7 | 76.5 | 92.9 | 94.5 | |||||||
| 3 | 24.7 | 40.5 | 61.0 | 68.9 | 72.0. | |||||||
| 4 | 85.4 | 90.3 | 94.7 | |||||||||
| 5 | 84.8 | 90.3 | 96.0 | |||||||||
| 6 | 80.5 | 91.0 | 97.8 | |||||||||
| 7 | 89.8 | 98.4 | 99.0 | |||||||||
| 8 | 99.4 | 100 | 100 | |||||||||
| 9 | 97.7 | 100 | 100 | |||||||||
| 10 | 74.4 | 95.0 | 100 | |||||||||
| 11 | 79.1 | 89.6 | 100 | |||||||||
| 12 | 39.5 | 81.5 | 100 | |||||||||
Commercial rate for application of spinosad is c.2000–4000 ppm