|
Chemical control of leafrollers - Resistance to insecticides |
| Leafrollers in New Zealand have a history of developing resistance to insecticides. The recorded cases are as follows: | |
| Leafroller species | Insecticide | Evidence from: | Resistance factor | Cross resistance: |
| Lightbrown apple moth, E. postvittana | Lead arsenate | Field | Not known | |
| (Nelson) | DDT, TDE | Laboratory and field | Not known | |
| organophosphates chlorpyrifos carbaryl |
Laboratory and field | 5 - 20 fold 2 - 3 fold ? |
OPs and carbaryl | |
| Greenheaded leafroller,
P. octo (Otago) |
azinphos-methyl chlorpyrifos carbaryl |
Laboratory and field | 14 - 20 fold 12 fold 8 fold |
OPs, carbaryl, tebufenozide |
| tebufenozide | Laboratory and field | 8 - 76 fold | azinphos-methyl | |
| P. octo (Hawkes Bay) |
azinphos-methyl chlorpyrifos |
Laboratory and field | 7 - 32 fold 3 fold |
|
| tebufenozide | Laboratory | 3-7 fold | ||
| Brownheaded leafroller,
C. obliquana (Hawkes Bay) |
azinphos-methyl | Laboratory and field | 4 - 12 fold | |
| tebufenozide | Laboratory | 14 fold | ||
| All of the recent cases have been subject to resistance management programmes. | ||||