This study shows that the currently available insecticides for control of D. suzukii provide protection against infestation by this pest, in both conventional and organic blueberry production. We used a semi-field residual bioassay with somewhat different
methods than the studies reported by Bruck et al. (2011) to measure both adult control and larval infestation levels with several insecticides.
These laboratory bioassays on field-aged residues supported the earlier reports that pyrethroid, organophosphate, and spinosyn insecticides provide from 5 to 14 days of residual control against D. suzukii, as measured by percent adult mortality. Beers
et al. (2011) conducted several laboratory bioassays in sweet cherries by testing field-aged residues on foliage and fruit, including one trial that examined eggs laid and adult emergence after exposure of flies to foliage and fruit 24 h after treatment.
The resulting adult mortality was high (>90%) for many of the insecticides ested,including malathion, spinetoram, and spinosad. Even with this high adult mortality, flies were able to lay eggs in fruit which were then able to develop to adults, albeit at lower levels than the controls. In our current study, high adult mortality was also observed for many of the compounds tested, especially at 1 DAT, but most treatments
This study shows that the currently available insecticides for control of D. suzukii provide protection against infestation by this pest, in both conventional and organic blueberry production. We used a semi-field residual bioassay with somewhat differentmethods than the studies reported by Bruck et al. (2011) to measure both adult control and larval infestation levels with several insecticides.These laboratory bioassays on field-aged residues supported the earlier reports that pyrethroid, organophosphate, and spinosyn insecticides provide from 5 to 14 days of residual control against D. suzukii, as measured by percent adult mortality. Beerset al. (2011) conducted several laboratory bioassays in sweet cherries by testing field-aged residues on foliage and fruit, including one trial that examined eggs laid and adult emergence after exposure of flies to foliage and fruit 24 h after treatment.The resulting adult mortality was high (>90%) for many of the insecticides ested,including malathion, spinetoram, and spinosad. Even with this high adult mortality, flies were able to lay eggs in fruit which were then able to develop to adults, albeit at lower levels than the controls. In our current study, high adult mortality was also observed for many of the compounds tested, especially at 1 DAT, but most treatments
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