Table 6.
Per cent in vitro mortality of laboratory and field isolates of Dermanyssus gallinae following exposure to either propoxur or pyrethroids (deltamethrin for isolates from France and Spain, cypermethrin for Brazil isolate)
| Isolate | Propoxur concentration (ppm) | Pyrethroid concentration (ppm) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 62.5 | 125 | 250 | 500 | 1000 | 62.5 | 125 | 250 | 500 | 1000 | |
| Lab 2 | 97.5 | 99.6 | 100 | 100 | 53.5 | 73.5 | 88.1 | 96.9 | ||
| Field 1 | 36.9 | 47.1 | 52.1 | nt | nt | |||||
| Field 2 | 7.6 | 11.6 | 10.9 | 13.2 | 13.8 | 3.3 | 6.4 | 3.1 | 3.2 | 4.9 |
| Field 3 | 7.7 | 8.1 | 6.4 | 5.2 | 12.4 | 16.3 | 11.7 | 11.0 | 13.8 | 12.9 |
| Field 13 | 17.7 | 30.2 | 15.6 | 15.6 | 19.8 | 2.1 | 3.1 | 4.1 | 7.3 | 15.6 |
Notes: Commercial rate for application of propoxur is 1000 ppm. Commercial rates for application of deltamethrin and cypermethrin are 250 and 150 ppm, respectively. For field isolate 13, for propoxur concentrations < 62.5 ppm, mite mortality ranged from 0.0 to 12.5% at 1.95 to 31.3 ppm, respectively. For cypermethrin mortality ranged from 0.0 to 1.0% at 1.95 to 31.3 ppm, respectively