WEBVTT - Planning for Prosperity: Mature fleabane control with Angus Butterfield

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<v S1>Controlling mature fleabane is tricky. With funding from the Hugh

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<v S1>Williamson Foundation and the Australian Government's Future Drought Fund. BCG

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<v S1>research agronomist Angus Butterfield completed a research project on controlling

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<v S1>mature fleabane, which is up next. The information shared is

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<v S1>based on research conducted for the purpose of exploring fleabane

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<v S1>control options, and should not be considered direct advice. Please

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<v S1>note some herbicide rates and applications discussed may not align

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<v S1>with registered label requirements or maximum residue limits. We strongly

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<v S1>encourage you to consult your agronomist or local adviser before

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<v S1>implementing any of the strategies covered here. They can provide

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<v S1>guidance tailored to your conditions, ensure compliance with current label requirements,

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<v S1>and help you adhere to MRL guidelines. This podcast is

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<v S1>sponsored by Action Steel. Today, I'm speaking with BCG research

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<v S1>agronomist Angus Butterfield about his research into summer fleabane control,

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<v S1>specifically when it's mature. So not when it's at the

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<v S1>rosette stage, but when it's elongated and it's mature because

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<v S1>that's when people often have the trouble. So welcome, Angus. Thanks, Janine.

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<v S1>Just for a start, can you give a little bit

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<v S1>of a background on you and then why you are

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<v S1>so interested in researching fleabane?

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<v S2>I'm originally from the outskirts of Melbourne, just out of

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<v S2>a town called Hurstbridge. Third year at the Birch Cropping

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<v S2>Group as a research agronomist. And the reason that I'm

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<v S2>interested in this stuff is because it has been such

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<v S2>a big issue for a lot of our growers. There's

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<v S2>been growers contacting us asking what is the solution for

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<v S2>this sort of issue, especially with a few of our

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<v S2>wet summers we've had recently. It's become an issue as

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<v S2>it's so hard to kill with some of our knockdown herbicides.

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<v S1>And where are most of those growers from? Angus.

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<v S2>So most of those growers at the minute are in

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<v S2>the mallee sort of region. So anywhere from all the

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<v S2>way up past sort of Balranald, all the way down

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<v S2>to Birchip, but we are seeing it start to spread

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<v S2>more and more into the Wimmera as well as the

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<v S2>North Central.

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<v S1>And why are we seeing that?

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<v S2>It's been around for a little while, more of a

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<v S2>Queensland New South Wales weed, Wade. But a lot of

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<v S2>guys I've been talking to have said after the floods

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<v S2>we had about ten years ago, it's come in. And

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<v S2>just due to how many wet summers we've had recently,

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<v S2>it's become more and more of an issue. Obviously, if

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<v S2>we're going to dry summer, we're not going to see

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<v S2>those weeds germinate over that time. So do you.

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<v S1>Think that the flood water helped disperse the seeds.

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<v S2>As it wasn't really around at the time? That's just

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<v S2>what I've heard. But yes, I would have thought so.

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<v S2>It's a windblown and I guess it can be spread

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<v S2>by water as well. One of the biggest issues that

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<v S2>they can spread from roadsides and fence lines.

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<v S1>Okay. So can you tell me a little bit about

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<v S1>fleabane and why it is so hard to control?

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<v S2>Yeah. So it's it's a broadleaf weed. So it emerges

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<v S2>sort of in that 10 to 30 degrees conditions. So

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<v S2>we often see it emerge in springtime once it gets

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<v S2>a bit of size about it. Its plant structure and

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<v S2>phenology makes it really difficult to kill. It's quite tolerant

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<v S2>to glyphosate, so your standard glyphosate spray won't really get

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<v S2>into it. And the reason that is because it's got

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<v S2>a low stomata count. It's got quite a waxy plant tissue.

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<v S2>It's got hairy leaves and they're quite small. So it's

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<v S2>got all these sort of characteristics that sort of make

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<v S2>it hard for our herbicides to translocate into. So it's

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<v S2>a surface germinating weed so often. Once upon a time

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<v S2>in our till systems, we could control it just because

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<v S2>once it gets buried, it's quite hard to germinate. Germinates

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<v S2>in our 1 to 2cm in depth. And also something

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<v S2>makes it so hard is that you might only see

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<v S2>1 or 2 weeds in your paddock because it produces

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<v S2>about 100,000 weed seeds per plant. You can see that

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<v S2>is a fair few and one where it can. Obviously,

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<v S2>it can turn into a blowout in a number of

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<v S2>years like quickly.

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<v S1>So why do you think it's important to research fleabane

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<v S1>control at this stage when it's mature?

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<v S2>So we often see fleabane germinate in the springtime. So

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<v S2>that's often under a crop. So it's quite easy to

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<v S2>kill at those smaller growth stages. But we often don't

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<v S2>get the chance to target them over those stages. So

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<v S2>like for our lentils, the only sort of options we've

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<v S2>got is until the end of harvest, which is desiccating.

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<v S2>And if they've been sitting in the ground for two months,

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<v S2>they've put a bit of a taproot in and they'll

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<v S2>elongate pretty much as soon as it warms up so

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<v S2>often hard to target them at those stages. Also, there's

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<v S2>some residual control that you can do. But again, just

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<v S2>due to our love of lentils at the minute and

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<v S2>our pulses, it's really hard to use any of those

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<v S2>residual herbicides just due to plant back issues that we

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<v S2>see with them now.

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<v S1>Can you tell me about your research project?

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<v S2>Yeah. So we're looking at during summer because obviously it

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<v S2>does emerge quite early and we have actually seen it.

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<v S2>I've seen two months ago at emerging in some crops.

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<v S2>And if you've got something like lentils in or any

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<v S2>sort of pulses apart from maybe chickpeas, there's no residual control.

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<v S2>You can't spray it on top of it. You've sort

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<v S2>of got to wait until you're desiccation stage. Same with

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<v S2>your wheat. There's like there is some options, but then

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<v S2>you're in terms of residual control, but then you're restricted

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<v S2>to your rotation. And there's not much flexibility there.

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<v S1>Right. So your research project is about fleabane control in

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<v S1>that summer wheat period after harvest but before you put

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<v S1>your next crop in.

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<v S2>Yes. Over that summer fallow period.

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<v S1>Okay. So what did you find?

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<v S2>So our research was a number of trials, but looking

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<v S2>at that elongated fleabane. So when they mature a bit

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<v S2>more natural tolerance to glyphosate and difficult to kill. We

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<v S2>looked at a few different trials. First we looked at

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<v S2>our first pass in the double knock situation. So we

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<v S2>looked at a bunch of Group four herbicides mixed with

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<v S2>glyphosate with a standard paraquat terrador double knock. And then

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<v S2>we looked at another trial with pretty standard sort of

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<v S2>first passes with a range of different double knock options,

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<v S2>usually a mixer with paraquat. Okay.

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<v S1>So generally speaking, most people would control this. Not in

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<v S1>one pass. They would do the double knock.

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<v S2>As far as I can see, I don't think there's

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<v S2>any sort of chemistry that we can use that will

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<v S2>get it done in one go. Out of all the

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<v S2>research I've seen and we've done, just a single pass

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<v S2>is just not effective. Okay.

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<v S1>So what did you find?

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<v S2>Um, so we found a few interesting things. We found

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<v S2>that a lot of our group four herbicides that are

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<v S2>commonly used in the summer. Fallow didn't actually give us

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<v S2>much more control than glyphosate, so starring dicamba and 240 ester,

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<v S2>we naturally see. And these are all rates that are

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<v S2>that were recommended by agronomists. We didn't actually see any

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<v S2>differences between using those chemistries with glyphosate and using glyphosate alone.

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<v S2>So what are the symptoms we saw were the burn

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<v S2>off symptoms from our paraquat. So it's suggesting that we

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<v S2>maybe those chemistries aren't quite getting into the plant. And

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<v S2>then we saw also two at 240 amine was better

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<v S2>than our ester. So we looked at about 85% control.

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<v S2>So it did improve control. But we're like like I

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<v S2>said before 85%. You're getting 15% through. So we saw

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<v S2>the symptoms from those treatments were more of the contact

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<v S2>herbicides that we'd put on the seven days after. So

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<v S2>we're saying that paraquat and our territorial spray in these

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<v S2>trials were doing most of the work. Those treatments were

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<v S2>pretty much similar to glyphosate. Still getting a fair big

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<v S2>seed set there for the next season, but the standout

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<v S2>in this trial was really another product. I mixed with glyphosate,

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<v S2>which was drop zone.

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<v S2>So it's a 240 amine product so similar to a amine.

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<v S2>But it has some some sort of surfactant package that

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<v S2>makes it translocated into the plant better, which we saw.

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<v S2>So it actually was 98% control. I think from seeing

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<v S2>those results, it might suggest that our biggest issue is

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<v S2>actually getting the herbicide into the plant. So the translocation.

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<v S2>So all of these herbicides like 24D amine can kill it.

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<v S2>It's just getting it in which is what we've seen. Wow.

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<v S1>So that's a group for again.

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<v S2>Yeah. Yeah. So all these chemistries in our first pass

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<v S2>trial were all Group four chemistries. Okay.

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<v S1>So that was the first pass. So you found that

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<v S1>the first pass the best was glyphosate with drop zone.

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<v S1>That was the best. And then the second best was.

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<v S2>So our sort of two 4D amines as well. So

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<v S2>out of our three different two 4D products you've got

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<v S2>drop zone with their best control. And then we've got

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<v S2>amine at our middle sort of and then our ester

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<v S2>at the end, which was surprising because especially because ester

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<v S2>has that bit of kick that most people. And yeah,

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<v S2>it is a pretty standard sort of product that a

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<v S2>lot of people would use.

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<v S1>So you said that trial that you were talking about, Angus,

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<v S1>that was with the first pass being those specific differences.

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<v S1>And then what was the second pass?

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<v S2>The second pass for all those treatments I just talked

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<v S2>about was, um, two liters of paraquat and 20g of terrador.

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<v S1>Okay, so onto the second trial. Angus, can you talk

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<v S1>to me about that?

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<v S2>Yep. So the second trial that we did looked at

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<v S2>again in a double knock situation, instead of looking at

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<v S2>the first spray that we do in that we looked

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<v S2>at the second spray. So the one that's done ten

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<v S2>days after the initial spray. So our first pass sprays

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<v S2>were pretty standard at a glyphosate with a common mixer.

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<v S2>But we looked at a range of different mixes, usually

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<v S2>with paraquat in this trial.

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<v S1>What were some of those mixes?

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<v S2>So there was from this trial, there was a few

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<v S2>interesting things from the second pass trial. So we looked

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<v S2>at a range of different group 14 herbicides. So Terrador

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<v S2>Rackstraw as well. We also looked at some camera sprayer rates.

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<v S2>So we bumped up rates to four liters as well.

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<v S2>So some of our better ones that we saw in

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<v S2>the second pass trial were some of the camera sprayer rates.

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<v S2>So higher rates of paraquat we fight with the higher

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<v S2>rates that you're able to put through a camera sprayer.

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<v S2>We got better control. So we saw that our best

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<v S2>control was with a very expensive brew. It had four

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<v S2>rows of paraquat, foreign mils of amatol and 40g of toradol,

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<v S2>which is very high, but we only saw 93% control.

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<v S2>So we're looking at a quite an expensive spray versus

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<v S2>what we what we talked about before with the drop

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<v S2>zone is that it's probably about half the cost. Another

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<v S2>interesting thing, we had a bit of a curveball treatment

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<v S2>in here, and it was aiming for 52l, as well

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<v S2>as star rain at 500 mils just with a paraquat. Terrible.

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<v S2>And we got 90% control. And that actually was the

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<v S2>second best performer. So we're saying that there is a

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<v S2>lot of different options and they can get quite expensive

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<v S2>in the second pass. But by what I've seen, your

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<v S2>first pass is the most critical stage. So you sort

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<v S2>of want to put your money in your first pass

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<v S2>and just run the standard second pass. So we're seeing

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<v S2>that glyphosate is not really working at all with our fleabane,

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<v S2>because there's two group fours mixed together with just a

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<v S2>standard double knock. We're getting very good control. We also

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<v S2>saw that Pteridophytes are like it's a massive thing now

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<v S2>in our summer spraying. It's a great bit of chemistry,

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<v S2>but in terms of fleabane, we didn't see any differences

0:11:23.290 --> 0:11:27.580
<v S2>between using that and with and without with paraquat either.

0:11:27.610 --> 0:11:32.260
<v S1>So the drop zone in the first pass was how effective?

0:11:32.530 --> 0:11:34.179
<v S2>98%.

0:11:34.179 --> 0:11:37.360
<v S1>And then in the second pass trial, what was the

0:11:37.360 --> 0:11:38.319
<v S1>most effective?

0:11:38.320 --> 0:11:39.340
<v S2>93%.

0:11:39.340 --> 0:11:41.530
<v S1>But that was with the really expensive brew.

0:11:41.559 --> 0:11:43.599
<v S2>Yeah. And that was through a camera spray as well.

0:11:43.600 --> 0:11:46.900
<v S1>So do you have any data, Angus, on how much

0:11:46.929 --> 0:11:48.520
<v S1>fleabane takes out of the soil?

0:11:48.550 --> 0:11:51.580
<v S2>I haven't got any data on it necessarily, but yes,

0:11:51.700 --> 0:11:54.490
<v S2>it's got a taproot. So evaporation will happen in your

0:11:54.490 --> 0:11:57.699
<v S2>top 20 to 30cm, so you'll lose it anyway. But

0:11:57.700 --> 0:12:00.730
<v S2>your stored water is underneath that. And it does have

0:12:00.730 --> 0:12:03.609
<v S2>a taproot and can tap into that. So that's with

0:12:03.610 --> 0:12:06.610
<v S2>any of our summer weed stuff. And because it's so hot,

0:12:06.640 --> 0:12:10.000
<v S2>it matures so quickly and can suck that water out quickly,

0:12:10.000 --> 0:12:12.579
<v S2>you can just see even this year, different sort of

0:12:12.610 --> 0:12:16.060
<v S2>summer spraying approaches, um, can make the difference between having

0:12:16.059 --> 0:12:17.470
<v S2>a crop and not having a crop in a year

0:12:17.470 --> 0:12:19.990
<v S2>like this, just because it's been a heavy reliance on

0:12:20.020 --> 0:12:21.640
<v S2>that subsoil moisture.

0:12:21.640 --> 0:12:24.910
<v S1>So what would your advice be, Angus to farmers that

0:12:24.910 --> 0:12:27.910
<v S1>are dealing with. Or they're seeing fleabane popping up now

0:12:27.910 --> 0:12:28.900
<v S1>in their paddocks.

0:12:29.140 --> 0:12:30.550
<v S2>Oh, the first thing you'd have to do would be

0:12:30.550 --> 0:12:32.380
<v S2>monitor it as close as you can, make sure you

0:12:32.410 --> 0:12:35.199
<v S2>know it's there. So if you've got any opportunities to

0:12:35.230 --> 0:12:37.930
<v S2>control it when it's small, do that. That's your best

0:12:37.929 --> 0:12:41.620
<v S2>bet is controlling it when it's at that immature stage

0:12:41.770 --> 0:12:43.870
<v S2>like most don't get the opportunity to do that and

0:12:43.870 --> 0:12:45.760
<v S2>you have to come back, come up with a strategy.

0:12:45.760 --> 0:12:48.250
<v S2>If there's any sort of options, you can do lentils.

0:12:48.250 --> 0:12:50.860
<v S2>If you've got some issues in that desiccating would be

0:12:50.860 --> 0:12:52.660
<v S2>definitely the way to go. And even a double knock

0:12:52.690 --> 0:12:56.200
<v S2>desiccation in cereals. Depending on what your rotation is like,

0:12:56.230 --> 0:12:58.600
<v S2>there is a bit of residual control options, but it's

0:12:58.600 --> 0:13:01.270
<v S2>probably a bit late in the season now. Um, but yeah,

0:13:01.300 --> 0:13:02.679
<v S2>just monitor it and get on as quick as you

0:13:02.679 --> 0:13:04.990
<v S2>can because as soon as they start getting a bit

0:13:05.020 --> 0:13:06.819
<v S2>in size, they are very hard to kill. Even with

0:13:06.820 --> 0:13:09.069
<v S2>those herbicides that I talked about, you still want to

0:13:09.070 --> 0:13:11.470
<v S2>get them early and can be saving some dollars there

0:13:11.470 --> 0:13:12.940
<v S2>as well. You've just got to stay on top of

0:13:12.940 --> 0:13:17.110
<v S2>it because as I said before, it's a windblown weed.

0:13:17.110 --> 0:13:20.110
<v S2>So regardless if you control your paddocks, if it's on

0:13:20.110 --> 0:13:21.790
<v S2>a fence line or if it's in a neighbour's paddock

0:13:21.790 --> 0:13:23.920
<v S2>or it's on a roadside, it can still blow over

0:13:23.920 --> 0:13:26.320
<v S2>into your paddock as well. So it's just constantly being

0:13:26.320 --> 0:13:28.599
<v S2>on top, like a lot of our summer words. Just

0:13:28.600 --> 0:13:31.990
<v S2>making sure you can just stop that set, that seed

0:13:32.020 --> 0:13:34.840
<v S2>set as much as you can. Like any way, depleting

0:13:34.840 --> 0:13:37.120
<v S2>the seed bank is your most important thing because all

0:13:37.120 --> 0:13:39.670
<v S2>of these can stay around your soil for years, and

0:13:39.700 --> 0:13:42.100
<v S2>the chemistry you use in the first pass seem to

0:13:42.100 --> 0:13:44.920
<v S2>be more important in controlling it, rather than trying to

0:13:44.950 --> 0:13:47.830
<v S2>make up for it in the second pass. So spend

0:13:47.830 --> 0:13:49.780
<v S2>your money in your first pass rather than your second pass.

0:13:49.780 --> 0:13:52.090
<v S2>Based off the research we did over the summer, that

0:13:52.090 --> 0:13:53.860
<v S2>would be my recommendation.

0:13:54.580 --> 0:13:56.980
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0:14:03.190 --> 0:14:04.390
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