Australian Herbicide Resistance Initiative (AHRI)

Blog: AHRI insight

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Australian Herbicide Resistance Initiative (AHRI)

Do Monsanto have the next big thing?

Imagine if some technology came along that made glyphosate kill glyphosate resistant weeds. If this did happen, what would we do with this technology? BioDirectTM (aka RNAi) is a new concept from Monsanto that could do just that. It could be the next big thing for the herbicide industry. The ‘i’ in RNAi stands for ‘interference’. RNA is essentially a small piece of genetic code that all living things use to carry out a specific function within a cell, including coding enzymes that plants need to survive. One way of killing the plant is to spray a herbicide that stops…

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Wild Oat

Australian Herbicide Resistance Initiative (AHRI)

Why do Wild Oats evolve resistance slowly?

Why is it that we can often kill wild oats (black oats) with grass sprays but the ryegrass in the same paddock evolved resistance to these herbicides years ago? The answer is in the genes. Ryegrass is like we humans – it must cross pollinate to reproduce and it has two copies of each gene (diploid). Wild oat is more like wheat – it mostly self-pollinates (88 to 100% self-pollination) and it has six copies of every gene (hexaploid). A single gene mutation can cause ryegrass to be resistant to a grass herbicide but it will have only a minor…

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