Early post-emergent part of annual ryegrass program
Annual ryegrass has been a challenging weed for Georgina Warne, who farms 2000 hectares of land with her father just south of Culgoa in Victoria.
Georgina said she had been back on the farm for the past four years and has utilised BOXER GOLD® herbicide each winter since, with their major crops being wheat and barley.
“We use BOXER GOLD® as a pre-em and an early post-em here on our farm to control ryegrass which is my most problematic weed. It is doing a wonderful job on my ryegrass.”
In a barley crop last season, it was used as an early post-emergent.
“You notice a little more ryegrass than you're expecting, and I've been hitting it and it has done an amazing job."
In the pre-emergent application, BOXER GOLD® is mixed with Treflan and a knockdown but put out straight if it is used as a post-emergent option.
“Two years ago, I skimped on wheat pre-ems, I think just a standard Treflan triallate, and then there was a heap of ryegrass,” Ms Warne said.
“I came back and whacked it with a full rate of BOXER GOLD® afterwards as a real salvage and that did a good job.
“The naughty little ryegrass sneaks through and when the crops look like they'll get through and have potential, you can justify it.
“It’s vitally important to use robust rates of pre-ems. We might not get another chance.”
BOXER GOLD® is being used to rotate the chemistry and as a superior product to Treflan, to really control the ryegrass numbers.
Ms Warne said BOXER GOLD® proved to be more economical than other options and had performed well.
"It comes in on the cheaper end of the premium pre-ems, which is a real win for everybody,” she said.
“In my first year farming I saw at harvest time that you can easily lose far more than $28 a hectare with ryegrass. For me, and my weed burden on the farm, it's a no brainer when you've got to think at the harvest end, what gets through will cost me a lot more."
As well as using BOXER GOLD®, Ms Warne is implementing other strategies as part of the WeedSmart Big 6 recommendations.
“Ryegrass is hitting us on our best, sandiest paddocks and we've been doing oaten hay for two years now and I'll keep it in the rotation to get away from chemicals. I put a chaff chute on the header as well just to do something for harvest weed seed management.”
She said they used agronomy consultant Ben Brennan, who had advised on the type of chemistry to suit their paddocks.
“My agronomist Ben is wonderful. He's been working with Dad and I for three years now and we've got a really good relationship with him. It's coincided with wonderful seasons.”
As well as being an avid BOXER GOLD® user, Ms Warne is a recent winner of the Syngenta BOXER GOLD® toolbox promotion, including Kincrome and Milwaukee tools valued at $7200. Entrants were asked to describe in 25 words or less what they most liked about BOXER GOLD®.
“Things will probably stop breaking around here, now I've got this toolbox," she joked.
Georgina Warne farms 2000 hectares in the Victorian Mallee, pictured with Syngenta Territory Sales Manager Lance Brown and tools she recently won in the BOXER GOLD® toolbox promotion.
Early post-emergent usage
BOXER GOLD® is a solid choice for those salvage jobs helping manage weed seed set, where a Group 15 (K, J) hasn’t already been used.
“Pre-emergent programs remain the best way to control weeds, including annual ryegrass,” Syngenta Technical Services Lead James Considine said.
“If growers are faced with a high number of survivors, it could be necessary to consider a salvage job to help manage the weed seed bank for years to come.”
The BOXER GOLD® label allows for early post-emergent management of annual ryegrass, while in the one-to-three leaf stage, where there is adequate soil moisture. Where prosulfocarb or S-metolachlor selective herbicide hasn’t already been used, BOXER GOLD® should be applied at a full-rate of 3 litres per hectare.
“Post-emergent grass weed control options are limited and can be expensive,” James said.
“BOXER GOLD® is a good option to supress those survivors and manage seed set. You may not achieve the 80 to 90 percent control that’s possible in a pre-emergent pattern but suppression in the order of 60 to 70 percent is feasible, provided that BOXER GOLD® is applied to moist soil and is incorporated with adequate rainfall while the target weeds are still in the one-to-three leaf stage.”
Where weeds do survive, BOXER GOLD® will still supress a majority of weeds, reducing potential seed set and significantly reduce competition for moisture and nutrients.
James said the real difference between control and suppression is most clearly observed where annual ryegrass populations are higher.
“Where 80 to 90 percent control is achieved in a population of 100 seeds/m2, this will result in as few as 10 seeds being returned to the weed seed bank - most people will be pleased,” he said.
“But if that same rate of control is applied to 1000 seeds a square metre, this is going to look ugly. It is important to pause and consider what risk any survivors pose for the future.”
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