Troy, Michigan: emerald ash borer larval density in green ash street trees and canopy thinning ratings of the same trees for 1.5 years after trunk injection of emamectin benzoate at rates of 0.10–0.60 g ai/2.54 cm dbh. Data are means ± SD. Each treatment has 10 replications unless indicated otherwise under mean ± SD as (n).
| Treatment | Treatment Dates | 2005 dbh (cm) | 2005 Canopy thinning (%) | 2005 Larvae per m2 | 2006 Canopy thinning (%) |
|---|---|---|---|---|---|
| Emamectin 0.10 g/2.54 cm dbh | 5-25-05 + 5-23-06 | 30.0 ± 3.6 | 16.5 ± 13.4 A | 0 ± 0 A | 16.7 ± 8.8 |
| Emamectin 0.20 g/2.54 cm dbh | 5-25-05 | 30.0 ± 3.6 | 25.0 ± 11.1 AB | 0 ± 0 A | 26.7 ± 25.0 |
| Emamectin 0.40 g/2.54 cm dbh | 5-25-05 | 30.5 ± 5.8 | 30.8 ± 22.1 AB | 0 ± 0 A | 28.2 ± 27.9 |
| Emamectin 0.48 g/2.54 cm dbh | 5-25-05 | 26.4 ± 6.4 | 26.8 ± 13.2 AB | 0 ± 0 A | 21.0 ± 14.5 |
| Emamectin 0.60 g/2.54 cm dbh | 5-25-05 | 30.4 ± 6.5 | 41.5 ± 26.0 B | 0 ± 0 A | 34.3 ± 40.2 (9) |
| Control | - | 29.6 ± 4.8 | 19.0 ± 14.7 A | 59.2 ± 72.0 B | 54.3 ± 33.9 (9) |
Means followed by the same letter are not significantly different at P = 0.05, by the Tukey-Kramer test.