Washington State University
Vancouver Research and Extension Unit
Vancouver, WA 98665-9752
Seven aphicide active compounds were compared with a malathion standard for efficacy and labeling/registration to control blueberry aphids in the Pacific Northwest. Mixed motile life stages of Ericaphis scammelli were collected on the infested terminals of ‘Nelson’ blueberry on 17 June 2005, from Ridgefield, WA. Uninfested terminal tips were placed in water filled vials plugged with cotton and individually treated with 1 ml of insecticide mixture with a Precision Potter Tower and replicated five times. After air-dried, terminals were singly placed in 6” Petri dishes and infested with five, wingless adult. The treatments were evaluated at 1, 2 and 3 days after treatment (Table 1). Adults were probed with a fine camel haired brush to confirm mortality because of the lack of knockdown effect from exposure to Fulfill and the repellency and antifeedant affect of Aza-Direct. After the first day, there were no significant differences between treatments at 2 and 3 DAT.
| Treatment | Rates (AI)/acre | Percent mortality | ||
|---|---|---|---|---|
| 1DAT | 2DAT | 3DAT | ||
| Means within columns followed by the same letter are not significantly different (Tukey HSD test P<0.05). | ||||
| Actara 25 WG | 0.05 lb | 74abc | 92a | 100a |
| Assail 70WP | 0.04 lb | 94ab | 98a | 100a |
| Provado 1.6F | 0.05 lb | 92ab | 98a | 100a |
| AzaDirect 1.2 IGR | 24 fl oz | 58c | 80a | 94a |
| AzaDirect 1.2 IGR | 32 fl oz | 72abc | 90a | 92a |
| Fulfill 50WG | 0.2 lb | 74abc | 84a | 94a |
| Imidan 70W | 0.94 lb | 66bc | 82a | 94a |
| Malathion 8F | 2.0 lb | 100a | ||
| Turbine 50WG | 0.09 lb | 78abc | 92a | 100a |
| Untreated check | 0d | 0b | 0b | |