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Blueberry Aphid, Ericaphis scammelli On Blueberry, 2005

Blueberry Aphid, Ericaphis scammelli On Blueberry, 2005

L. K. Tanigoshi and J. R. Bergen
Washington State University
Vancouver Research and Extension Unit
Vancouver, WA 98665-9752
tanigosh@wsu.edu, bergenj@coopext.cahe.wsu

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.

Table 1.

Percent mortality
Treatment Rates (AI)/acre 1DAT 2DAT 3DAT
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
Means within columns followed by the same letter are not significantly different (Tukey HSD test P<0.05).