Australian Herbicide Resistance Initiative (AHRI)

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Australian Herbicide Resistance Initiative (AHRI)

Microbial degradation of propyzamide – will we have a problem?

Some excellent research conducted by Stephen Hole, under the watchful eye of Professor Steve Powles at the University of Adelaide in the mid-1990’s investigated the microbial degradation of propyzamide and another similar herbicide, carbetamide. Enhanced microbial degradation is where the soil bacteria that can eat a particular herbicide build up to very high levels so when the herbicide is applied it is broken down very quickly, effectively reducing the half-life of the herbicide.

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narrow windrow burning

Australian Herbicide Resistance Initiative (AHRI)

Harvest weed seed control is now mainstream

Australians invented the lawn mower, rotary clothes hoists, plastic bank notes, WiFi, the electric drill, and five of the six harvest weed seed control (HWSC) techniques. And while the Canadians invented the chaff cart (to feed livestock) it was Australian farmers and researchers who started using it for HWSC. So we’re going to claim HWSC as a true blue Aussie invention too! We are the inventors of some of the key tools of HWSC and a recent GRDC grower survey has shown that we are by far the world leaders in the adoption of these practices. Not so long ago…

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stressed weeds

Australian Herbicide Resistance Initiative (AHRI)

Why thirsty weeds are hard to kill

Unfortunately, large parts of Western Australia, South Australia and Queensland are as dry as a London newspaper! This edition of AHRI insight looks to address the issue of spraying stressed weeds. We had to go back to 1995 to find some relevant research, but it was worth it. The GRDC funded research conducted by Dave Minkey and John Moore at DAFWA in the 90s is pure gold! In a dry year, we’re often faced with the whole kit and caboodle – moisture stressed weeds, high temperatures, low relative humidity and long durations between rainfall events.

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HSD

Australian Herbicide Resistance Initiative (AHRI)

Harvest weed seed control tools – they all work

On November 5th, 2010, a truck arrived at Yuna at the northern tip of the Western Australian wheatbelt. Its cargo was a John Deere 9650 harvester with a tow-behind Harrington Seed Destructor attached. Twenty local farmers had arrived to see the new machine that they’d heard about for so long. And what did he find from two years of this GRDC funded, AHRI supported research? One, solitary number: 60%. That’s not the whole story though…read on for more!

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Australian Herbicide Resistance Initiative (AHRI)

Double breaks – a double shot at annual ryegrass

Short black, long black, double shot, double break? Coffee preference is a little like crop sequences. Perhaps you’re a ‘short black’ wheat-canola type, strong on inputs? Or a ‘long black’ type who likes to dilute their rotations a bit more? When it comes to managing annual ryegrass populations, Tony Swan and the research team from CSIRO Plant Industry and FarmLink, have shown that ‘double shots’ are the key.

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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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Australian Herbicide Resistance Initiative (AHRI)

Glufosinate resistance – we know what it’s not

“There are known knowns; there are things we know we know. We also know there are known unknowns; that is to say, we know there are some things we do not know. But there are also unknown unknowns – the ones we don’t know we don’t know. And if one looks throughout the history of our country and other free countries, it is the latter category that tends to be the difficult ones,” Donald Rumsfeld, US Secretary of Defense 2001-2006. Man, that’s deep! It’s wonderful for a scientist to have a hypothesis, do the research, and find that they were…

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Australian Herbicide Resistance Initiative (AHRI)

Mini-series – ‘Pre-emergent: A tale of four herbicides’ | Season Finale – Episode 4: ‘Redemption’

They said ‘yeah, it happened in the lab but that will never happen in real life’. The evil Busi said ‘I’m not a bad person, I’m not trying to create a monster, I just found something really bad and felt that I should tell you about it’. The naysayers said, ‘sure, just tell us when it happens in real life, then we’ll believe you’. Guess what, it happened! Dun dun duuuun!!!! Canadian researchers Mangin, Hall and Beckie have found wild oats that are resistant to Avadex®, and have never been sprayed with Sakura®, were found to be Sakura® resistant. This…

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