herbicide mechanisms

March 31, 2021

2,4-D synergises metribuzin

Synergy between herbicides is rare, but extremely sort after and this synergy is often claimed but it takes a specific research technique to confirm the synergy. Australian farmers and agronomists have previously observed synergy between phenoxy herbicides (2,4-D) and PSII herbicides (Group C / Group 3 herbicides such as metribuzin) and now we know why, thanks to this new AHRI research.

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AHRI Insight

December 1, 2020

The herbicide mixture is greater than the sum of herbicides in the mix

AHRI researcher, Dr Roberto Busi is no philosopher, but he has recently published some significant research that shows that Aristotle knew a thing or two about herbicide resistance despite being born over 2000 years before the first herbicide. Amazing! The message from this research – never assume that a herbicide mixture will fail even if there is resistance to both components of the mix.

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AHRI Insight

November 3, 2020

2,4-D antagonises glyphosate, especially in glyphosate resistant weeds

Some recent research by a former AHRI researcher Jingbo Li and others shows that glyphosate resistance changes this. They studied two populations of barnyard grass with relatively low-level glyphosate resistance and found that when 2,4-D Amine or Ester was added to the tank with glyphosate, barnyard grass control was greatly reduced. They went on to discover that this is due to an effect on uptake and translocation.

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AHRI Insight

August 4, 2020

Metribuzin resistant ryegrass via metabolism

This AHRI insight is not for the faint-hearted. This recent AHRI research by Chinese postdoc Hongju Ma and others documents the first case of metabolic resistance to metribuzin in ryegrass in Australia. The ryegrass in this population was only about 3 fold resistant to Atrazine and Metribuzin. The researchers used a P450 inhibitor, PBO, and radiolabelled metribuzin to help determine that the resistance is metabolism-based, likely due to P450 enzyme activity.   

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AHRI Insight

June 30, 2020

2,4-D resistance – it’s all about perception

This AHRI insight is not for the faint-hearted. It is the work of AHRI researcher, Dr Danica Goggin who has dedicated many years to working out how auxin herbicides such as 2,4-D and Dicamba work, and how plants evolve resistance to them.

Danica’s research found that plants with fewer receptors on their cell membranes were resistant to 2,4-D due to reduced perception of the 2,4-D.

Putting this molecular biology research into words is challenging, so we have created some videos that explain it. 

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AHRI Insight

March 11, 2020

Luximax gets its own NEW box

We all put things in boxes inside our head to help us organise our brain. A few of the important boxes I have inside my head – fishing spots, great moments in sport, top five meals of all time, jokes, song lyrics, useless trivia, movie quotes, WA town license plates, and of course the nothing box (the place every man retreats to when he has five minutes of peace and quiet!). Ok, it’s not an over-achieving brain but it gets me by.

However, sometimes something new will come along and it won’t fit into your existing boxes. It might need a new box.

Knowing how to use a new product in mixes and rotations with other herbicides can be a little confusing, hence the development of the “boxes” by the AHRI team a couple of years ago to help you put the right herbicides in the right boxes inside your head.

So, when considering this, what box do we put Luximax (Cinmethylin®)? Well… it gets its own NEW box!

AHRI researcher Dr Roberto Busi is helping us to understand some of these new products before they come to market. He recently investigated the product Cinmethylin which is a new BASF product called Luximax

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AHRI Insight
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