Paul A Umina1,2, Alan Lord3, Svetlana Micic4, Owain Edwards5. 1. School of BioSciences, Bio21 Institute, The University of Melbourne, Parkville, Victoria, Australia. 2. Cesar, 293 Royal Parade, Parkville, Victoria, Australia. 3. Department of Agriculture and Food Western Australia, South Perth, WA, Australia. 4. Department of Agriculture and Food Western Australia, Albany, WA, Australia. 5. CSIRO Land & Water, Centre for Environment and Life Sciences, Floreat, WA, Australia.
Abstract
BACKGROUND: The redlegged earth mite (Halotydeus destructor) is an agricultural pest in Australia that attacks a wide variety of crops and pasture species. Chemicals remain an important part of control strategies for H. destructor, despite the existence of resistance to pyrethroid insecticides in this species. Recent chemical control failures involving a second insecticide class, organophosphates, were investigated using pesticide bioassays. RESULTS: We confirmed, for the first time, resistance to organophosphates in H. destructor, and show that resistance is not confined to a single property, or region. There was no evidence that resistance to organophosphorus chemicals has evolved in Australian states outside of Western Australia. CONCLUSION: These findings demonstrate the strong evolutionary capability of H. destructor and highlight the need for ongoing resistance surveillance within Australia.
BACKGROUND: The redlegged earth mite (Halotydeus destructor) is an agricultural pest in Australia that attacks a wide variety of crops and pasture species. Chemicals remain an important part of control strategies for H. destructor, despite the existence of resistance to pyrethroid insecticides in this species. Recent chemical control failures involving a second insecticide class, organophosphates, were investigated using pesticide bioassays. RESULTS: We confirmed, for the first time, resistance to organophosphates in H. destructor, and show that resistance is not confined to a single property, or region. There was no evidence that resistance to organophosphorus chemicals has evolved in Australian states outside of Western Australia. CONCLUSION: These findings demonstrate the strong evolutionary capability of H. destructor and highlight the need for ongoing resistance surveillance within Australia.