Pre- and post-treatment monthly meansz (4-week intervals) of numbers of live red gum lerp psyllid nymphs per leaf in trees treated with insecticidesy.
| Treatment | Pretreatment | Post-treatment | ||
|---|---|---|---|---|
| 7/1/99 | 7/16 – 8/6 | 8/13 – 9/3 | 9/10 – 10/2 | |
| Imidaclopridx | 5.42 a | 2.28 a | 0.49 a | 0.43 a |
| Combinationw | 5.36 a | 1.77 a | 1.16 a | 1.55 a |
| Oxydemeton-methylv | 5.26 a | 0.87 a | 2.51 a | 4.77 b |
| Untreated | 5.62 a | 4.70 b | 8.32 b | 4.22 b |
↵z Means followed by the same letter are not significantly different at the 5% level (Fisher’s PLSD).
↵y Treatments applied July 8, 1999.
↵x Imicide® 3 mL 10% active ingredient per 5-cm trunk diameter.
↵w Imicide® 2 mL 10% active ingredient and Injecticide® 3mL 50% active ingredient per 5-cm trunk diameter.
↵v Injecticide® applied 3 mL of 50% active ingredient per 5-cm of trunk diameter.