Number of elm leaf beetle larvae surviving six days after feeding on leaves from abamectin-injected and untreated trees collected 83 days after treatment.
| Number of larvae surviving (mean ± SE) | ||
|---|---|---|
| Treatment | Old foliage (5 larvae) | New foliage (3 larvae) |
| Abamectin | 2.0 + 0.6 a | 1.4 + 0.3 a |
| Control | 4.8 ± 0.1 b | 2.8 ± 0.1 b |
New foliage: leaves that were not present at the time of treatment (except within buds). Old foliage: leaves that were expanded at the time of treatment. Means in the same column followed by different letters are significantly different (p < 0.001, t-test for means with unequal variances).