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Australian Herbicide Resistance Initiative (AHRI)

Pre-emergent herbicides in stubble – strike or foul?

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Australian Herbicide Resistance Initiative (AHRI)

Pre-emergent herbicides in stubble – strike or foul?

Ever tried walking out onto a 10-pin bowling alley? It’s generally not pretty, often resulting in a rapid and undignified descent to ground level…But that’s just what we need to get pre-emergent herbicides to slide off stubble and into the soil, which can be difficult in higher residue systems. Rainfall is obviously a key driver in leaching herbicides from stubble before they dissipate, but as we all know rain can be an unpredictable beast. Fortunately, research has shown that some pre-emergent herbicides require far less rainfall to move off stubble and into the soil where they can control germinating weeds. 

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Stubble

Australian Herbicide Resistance Initiative (AHRI)

Herbicides and stubble – some wash off, some don’t

Which herbicides wash off wheat stubble? Ask any farmer how hard it is to wash the yellow trifluralin stain out of their clothes and you had better be ready for a tirade of domestic hardship! “I just throw them straight in the bin these days”, commented one irate farmer. “I would sooner try and wash off a tattoo than remove that horrible yellow stuff from my work shirts.” No wonder the urban myth tells us that trifluralin was originally developed as clothes dye. If Yaseen Khalil’s recent research is anything to go by, trifluralin would make a wonderful dye and…

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Gayle Somerville, pre-em

Australian Herbicide Resistance Initiative (AHRI)

Why do pre-em herbicides last so long before resistance bites?

Once in a while, someone comes along and asks a question that you have never given much consideration to. Like, “Why does beer garden beer taste so bad?” or “Why do hotels always give away piles of stuff except for what you actually need, like a toothbrush or a razor?” and “Why do our pre-emergent herbicides last longer than our post-emergent herbicides before resistance bites”? Sure, we had probably considered this question in the past, but many of us would have just assumed that the gene frequency for resistance to our pre-emergent herbicides was low. However, Gayle Somerville, who recently…

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