3 years ago

Baseline susceptibility of spotted wing Drosophila (Drosophila suzukii) to four key insecticide classes

John C. Wise, David Mota-Sanchez, Steven Van Timmeren, Rufus Isaacs
BACKGROUND The invasive drosophilid pest, Drosophila suzukii Matsumura, is affecting berry production in most fruit-producing regions of the world. Chemical control is the dominant management approach, creating concern for insecticide resistance in this pest. We compared the insecticide susceptibility of D. suzukii populations collected from conventional, organic, or insecticide-free blueberry sites. RESULTS The sensitivity of D. suzukii to malathion and spinetoram declined slightly across the three years of monitoring, whereas it was more consistent for methomyl and zeta-cypermethrin. The sensitivity of D. suzukii to all four insecticides (LC50 and LC90 values) did not differ significantly among the blueberry fields using different management practices. CONCLUSIONS The baseline sensitivity of Drosophila suzukii has been characterized, allowing future comparisons if field failures of chemical control are reported. The concentration achieving high control indicates that effective levels of control can still be achieved with field rates of these four insecticides. However, declining susceptibility of some populations of D. suzukii to some key insecticides highlights the need for resistance monitoring.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ps.4702

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