U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.


Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Main content area

Laboratory studies of insecticide efficacy and resistance in Drosophila suzukii (Matsumura) (Diptera: Drosophilidae) populations from British Columbia, Canada

Michael J Smirle, Cheryl L Zurowski, Murali‐Mohan Ayyanath, Ian M Scott, Kenna E MacKenzie
Pest management science 2017 v.73 no.1 pp. 130-137
Drosophila melanogaster, Drosophila suzukii, adults, bioassays, cherries, crop year, dose response, females, insecticide resistance, malathion, males, orchards, resistance management, British Columbia
BACKGROUND: Spotted wing drosophila (SWD), Drosophila suzukii (Matsumura), control can be improved with better knowledge of insecticide efficacy, timing of sprays and rotations with registered products during the crop year. An efficacy bioassay was applied to study the dose response of adult laboratory‐reared SWD collected from a cherry orchard in British Columbia (BC), Canada, to 11 insecticides. RESULTS: Age‐ and sex‐specific toxicities with the most effective insecticide, malathion, determined that older male SWD were significantly more susceptible than females. The selection for polygenic resistance to malathion using repeated exposure to sublethal concentrations with both the original and an additional blueberry‐collected population of laboratory‐reared SWD determined no significant difference in susceptibility after 30 generations. CONCLUSION: Possible reasons reported in D. melanogaster studies where resistance did not occur after insecticide selection included avoidance and associated microbial complexes. The low level of malathion resistance observed in the selected SWD populations and a field‐collected population is useful information in the development of insecticide resistance management programmes. © 2016 Her Majesty the Queen in Right of Canada Pest Management Science © 2016 Society of Chemical Industry