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Australian Herbicide Resistance Initiative (AHRI) insight #106 - ‘Clear and present danger’ – glyphosate resistance in the Northqrcode

Sep. 11, 2018

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Researchers and growers have long been anticipating glyphosate resistance in the Northern cropping region and now the preliminary results from the first herbicide resistance survey in the region are confirming the ‘clear and present danger’ facing the grains industry.
 
A ruling of ‘clear and present danger’ was originally used to restrict American’s First Amendment rights to freedom of speech, press or assembly, particularly during war. The suggestion being that exercising this right, could, at certain times put other Americans, or the war effort, in danger.
 
In the case of glyphosate, the suggestion is that while growers have previously enjoyed the ‘freedom’ to use this herbicide as their go-to, highly effective tool for weed control, there is now strong evidence that they should look for ways to protect this mode of action and implement a variety of tools such as the double knock, rotating herbicides and seed bank management as a matter of urgency.
 
If only herbicide-resistant weeds grew different coloured flowers or were twice as tall as susceptible individuals! Then there would be no need for weed surveys or herbicide resistance testing. The reality is that the only way to confirm and measure resistance is to scientifically collect samples and expose the samples to a range of herbicides.
 
While a number of surveys have been conducted in southern and western cropping regions in Australia since the 1990s, there had been no surveys in northern NSW or Queensland until very recently. The only information about the incidence of herbicide resistance had come through the herbicide resistance testing services, where samples are expected to be heavily biased towards resistance.
 
With funding from GRDC, Dr Adam Jalaludin, Department of Agriculture and Fisheries, Queensland and Dr John Broster, Charles Sturt University NSW, are leading their respective teams through the process of testing samples and analysing the results for weed seed collected throughout the Northern region in 2016/17. Click through below to learn more.
 
 

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