Characterization of Field-Derived Drosophila suzukii (Diptera: Drosophilidae) Resistance to Pyrethroids in California Berry Production

The spotted-wing drosophila, Drosophila suzukii (Matsumura), is a global economic pest of berry crops and stone fruit. Since management of this pest primarily relies on calendar insecticide applications, and field-derived resistance to spinosad has already been documented in California caneberry pro...

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Bibliographic Details
Published in:Journal of economic entomology 2022-10, Vol.115 (5), p.1676-1684
Main Authors: Ganjisaffar, Fatemeh, Demkovich, Mark R., Chiu, Joanna C., Zalom, Frank G.
Format: Article
Language:English
Subjects:
Agricultural practices
bifenthrin
cross-resistance
Cypermethrin
Drosophila
Drosophila suzukii
Fruits
Global economy
INSECTICIDE RESISTANCE AND RESISTANCE MANAGEMENT
Insecticides
Insects
Integrated pest management
Pest control
pest management
Pesticide resistance
Pests
Pyrethroids
Spinosad
spotted-wing drosophila
zeta-cypermethrin
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Summary:The spotted-wing drosophila, Drosophila suzukii (Matsumura), is a global economic pest of berry crops and stone fruit. Since management of this pest primarily relies on calendar insecticide applications, and field-derived resistance to spinosad has already been documented in California caneberry production, there is significant concern for development of resistance to other insecticides. In this study, susceptibility of D. suzukii populations collected from caneberry and strawberry fields to two pyrethroids, zeta-cypermethrin, and bifenthrin, was assessed in 2019 and 2020. Resistance to both pyrethroids were observed in flies from all sampling sites. For flies collected from caneberries in 2019, the LC50 values ranged from 4.5 to 5.2 mg liter–1 with RR50s ranging from 7.5- to 8.7-fold. Our 2020 assays showed that susceptibility of flies to the discriminating dose of zeta-cypermethrin decreased significantly as the season progressed. For flies collected from strawberries in 2020, the LC50s ranged from 19.0 to 36.1 mg liter–1 and from 30.3 to 90.7 mg liter–1 for zeta-cypermethrin and bifenthrin, respectively. The RR50 values varied from 19.0- to 36.1-fold for zeta-cypermethrin and from 15.9- to 47.7-fold for bifenthrin. This study is the first report of field-derived pyrethroid resistance in D. suzukii from two major California berry production areas. Adoption of informed insecticide resistance management practices would be essential to prolong the efficacy of products available to control D. suzukii. Future molecular work is needed to unravel the underlying genetic mechanisms conferring the observed pyrethroid resistance and to develop robust diagnostics that can inform integrated pest management of this pest.
ISSN:0022-0493
1938-291X
DOI:10.1093/jee/toac118