Percent mortality of Synanthedon culiciformis larvae In alder trees based on frass activity after treatment with Stelnernema feltlae at Davis, 1983.
| Nematode treatment | No. trees | Active galleries pre-treatment | Active galleries post-treatment | % mortality |
|---|---|---|---|---|
| 0 | 4 | 60 | 73 | 0 |
| 4000/ml (trunk)a | 4 | 57 | 13 | 77 |
| 8000/ml (trunk)a | 4 | 62 | 10 | 84 |
| 4000/ml (gallery)b | 4 | 14 | 1 | 93 |
| 8000/ml (gallery)b | 4 | 14 | 2 | 86 |
Hudson sprayer—sprayed to runoff on tree trunks
4000 nematodes/ml; trees received an average of 6.5 million nematodes
8000 nematodes/ml; trees received an average of 11.5 million nematodes
Squirt bottle—each gallery given ca 4.5 ml of nematode suspension
4000 nematodes/ml per gallery received 18,000 nematodes
8000 nematodes/ml per gallery received 36,000 nematodes