Australia
June 12, 2015
Wild oat is the Yohan Blake of weeds. Yohan is an amazing sprinter, but unfortunately for him, his Jamaican training partner Usain Bolt is faster.
Wild oat is a significant resistant weed, but it is no annual ryegrass.
AHRI researcher, Dr Roberto Busi recently showed that repeated use of low doses of Hoegrass® caused only a minor (2 fold) shift towards resistance in wild oat.
When Dr Paul Neve did a similar study in 2005, three low doses of Hoegrass® caused 40 fold resistance in annual ryegrass.
Annual ryegrass is the world champ of herbicide resistance, and while weeds such as wild oat are a threat, they simply do not evolve resistance as fast as ryegrass.
It is the self-pollinating and hexaploid (six copies of each gene) nature of wild oat that leads to slow resistance evolution.
Evolving resistance in wild oat takes considerable effort. Often, grain growers with resistant wild oat have repeatedly used a single herbicide over and over until it broke.
In a weed like wild oat that evolves resistance slowly, simple strategies such as herbicide rotation will go a long way towards delaying the onset of resistance.
How does self-pollination and polyploidy affect resistance evolution?
Read more
P.S. Over the next few months, we're showcasing the Ryegrass Integrated Management (RIM) model. Find out what RIM can do with our easy-to-digest, done-for-you output from RIM. It only takes a couple of minutes! Click here or follow the link below for newest run.
AHRI insight is compiled by Peter Newman, Brogan Micallef and Lisa Mayer
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