Insecticide preservation key to strategy

20 Apr, 2017 10:12 AM
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RLEM feeding can lead to distortion or shrivelling of plant leaves and affected seedlings may die where there are high populations present.
In addition, localised resistance to organophosphates (OPs), including omethoate and chlorpyrifos, h
RLEM feeding can lead to distortion or shrivelling of plant leaves and affected seedlings may die where there are high populations present.

A RESISTANCE management strategy aims to conserve the effectiveness of the limited insecticide options available for controlling redlegged earth mites in grain crops and pastures.

It is one of two regionally relevant strategies developed by the National Insecticide Resistance Management (NIRM) working group of the Grains Pest Advisory Committee (GPAC), and endorsed by CropLife Australia.

GPAC is a Grains Research and Development Corporation (GRDC)-funded project which provides strategic advice on pest issues.

RLEM (Halotydeus destructor) is a major threat to a variety of Australian crops and pastures, with canola, lupins and legume seedlings the most susceptible to attack.

Department of Agriculture and Food WA (DAFWA) entomologist Svetlana Micic said high levels of resistance to synthetic pyrethroids (SPs), including bifenthrin and alpha-cypermethrin, were becoming more common across the WA grainbelt.

“In addition, localised resistance to organophosphates (OPs), including omethoate and chlorpyrifos, has been discovered on multiple WA properties,” Ms Micic said.

NIRM chairman and entomologist Paul Umina, of cesar Australia, said growers needed to understand how to minimise the development of resistance and encouraged them to adopt the recommendations of the Resistance Management Strategy which would help guide their selection of control options.

He said the rotation of different chemical groups was central to the strategy and would minimise the selection pressure for resistance to the same insecticide group across consecutive generations of RLEM.

“Do not use the same chemical group across successive spray windows (on multiple generations of RLEM) as this will select for resistance to that chemical group,” Dr Umina said.

“In addition it is recommended that co-formulations or chemical mixtures are best reserved for situations where damaging levels of RLEM and other pest species are present, and a single active ingredient is unlikely to provide adequate control.”

Dr Umina said growers should, at all costs, avoid the practice of ‘insurance’ sprays and advised that using the broadest range of integrated pest management (IPM) strategies was the best way to avoid future spray failures and prevent or delay the development of insecticide resistance.

Growers who find RLEM that survive registered rates of insecticide treatments next year can arrange for resistance testing to be conducted by contacting Ms Micic on svetlana.micic@agric.wa.gov.au or 9892 8591.

FarmWeekly

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The Minister of Ag can use WA's Gene Technology Act 2006 to manage GM & GM-free crops for market
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Time will judge if they can implement what growers are asking for. Not what a director
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Absolutely agreed. Chinese demand for high-quality protein is increasing, as is demand from