Resistance found in notorious crop pest

Resistance found in notorious crop pest

Cropping
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SCIENTISTS have discovered insecticide resistance in redlegged earth mite in the southern cropping region.

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PEST THREAT: Redlegged earth mite is a threat to a variety of Australian crops and resistance has been discovered in SA. Photo: ANDREW WEEKS.

PEST THREAT: Redlegged earth mite is a threat to a variety of Australian crops and resistance has been discovered in SA. Photo: ANDREW WEEKS.

SCIENTISTS have discovered insecticide resistance in redlegged earth mite in the southern cropping region.

Recent laboratory studies on several RLEM populations in SA have confirmed resistance to both synthetic pyrethroids, including bifenthrin and alpha-cypermethrin, and organophosphates, including omethoate and chlorpyrifos.

This is the first time resistance has been detected in RLEM populations outside of WA, where resistance can be found throughout that state’s grain belt.

Research suggests that while it is too early to determine just how widespread the distribution of resistance is in the south, resistant samples have come from more than one paddock.

Cesar researcher James Maino is urging growers to pay close attention to RLEM populations sprayed with insecticide so that any potential resistance can be detected early before developing into a more serious issue.

“If growers notice poor efficacy from spraying or experience chemical control failures across autumn and winter, we want to know about it,” he said.

  • Details: Dr Maino 03 9349 4723.
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