Resistant ryegrass

[Scrambler]

I'd be very grateful for some advice on how to deal with resistant rygrass.
It was suspected 2 years ago when a few patches in wheat weren't killed by spot application of Broadway Star, but at the time it was thought that this could have been due to the size of the plants. Last year in linseed rygrass was uncontrollable. In hindsight I should have destroyed the linseed/ryegrass to prevent seed return.
In the current wheat crop it had a pre-em of Trooper and Herald (pendimethalin + flufenacet + diflufenican) which didn't control it particularly well, and a spring application of Horus. The Horus knocked it back but it recovered.
Next crop will be osr so I'm assuming I'll get good control with Crawler and Kerb.
But what to do after that? It's got bad very quickly.

 

[Farmer Roy]

I'd be very grateful for some advice on how to deal with resistant rygrass.
It was suspected 2 years ago when a few patches in wheat weren't killed by spot application of Broadway Star, but at the time it was thought that this could have been due to the size of the plants. Last year in linseed rygrass was uncontrollable. In hindsight I should have destroyed the linseed/ryegrass to prevent seed return.
In the current wheat crop it had a pre-em of Trooper and Herald (pendimethalin + flufenacet + diflufenican) which didn't control it particularly well, and a spring application of Horus. The Horus knocked it back but it recovered.
Next crop will be osr so I'm assuming I'll get good control with Crawler and Kerb.
But what to do after that? It's got bad very quickly.

You need to talk to @CornishTone - with his recent experiences he is the man with the strategies for resistant ryegrass

We have big issues with it here in Australia & there is much time, effort & money going into developing strategies for it. I ( & cornishtone ) have spoken about it quite a bit here before, but no one ever seemed that interested in the findings & experiences of another country

 

[deleted user 837354]

I'd be very grateful for some advice on how to deal with resistant rygrass.
It was suspected 2 years ago when a few patches in wheat weren't killed by spot application of Broadway Star, but at the time it was thought that this could have been due to the size of the plants. Last year in linseed rygrass was uncontrollable. In hindsight I should have destroyed the linseed/ryegrass to prevent seed return.
In the current wheat crop it had a pre-em of Trooper and Herald (pendimethalin + flufenacet + diflufenican) which didn't control it particularly well, and a spring application of Horus. The Horus knocked it back but it recovered.
Next crop will be osr so I'm assuming I'll get good control with Crawler and Kerb.
But what to do after that? It's got bad very quickly.

Find out if axial will kill it in your wheat. It might be resistant to fops and dims and SUs but Pinoxaden and possibly centurion max might be a surprise to it.

You can collect the seeds and send them for actual resistance testing where they will test them against a range of actives under laboratory conditions.

Laser might still kill it, too.

I have known Broadway star and Pacifica fail to do what I expected them to before, it may have been down to conditions at the time rather than outright resistance.

 

[Brisel]

I've had limited success with Broadway Star. It stunts it nicely but failed to stop seed return. I've got a couple of stubborn patches that are getting smaller but not quickly enough for my liking. A few spring crops are in order for that field as well as the usual herbicide programmes.

As above, get some seed tested so you know exactly what does & doesn't work on it. Axial & Laser are best depending on the crop. I'd use Laser as part of a sequence with Kerb/Crawler. Ryegrass germinates when it feels like doing so. For this reason stale seedbeds are good but like all grass weeds, you need a multitude of control measures and timings to get on top of it. Avadex doesn't list ryegrass on the label. Defy would be a better bet to add to full rate flufenacet pre emergence. Don't forget to consider if your water needs treating depending on the herbicide (glyphosate, Laser, SUs like Broadway). Always use adjuvants as recommended on the labels. A well tillered ryegrass plant is very waxy & shiny so needs the right solution hitting it with small droplets.

 

[deleted user 837354]

Forgot to mention defy.

 

[Scrambler]

Thanks for the replies.
Getting it tested makes sense. At least that will stop me spending money on chemicals that don’t work!

 

[Hampton]

Find out if axial will kill it in your wheat. It might be resistant to fops and dims and SUs but Pinoxaden and possibly centurion max might be a surprise to it.

You can collect the seeds and send them for actual resistance testing where they will test them against a range of actives under laboratory conditions.

Laser might still kill it, too.

I have known Broadway star and Pacifica fail to do what I expected them to before, it may have been down to conditions at the time rather than outright resistance.

Applied broadway to a field and the ryegrass grew through it in patches. Sprayed these areas with axial and it’s now all dead. Bit of an eye opener.

 

[colhonk]

Axial pro done absolutely nothing on mine............again.

 

[phil]

Get your water tested for pH and carbonates
I’ve solved few issues that way

 

[Retraceh]

Axial pro has done a good job this year with me. Centurion max also done a very good job in S Beans.

 

[deleted user 837354]

Ive had 'failures' with some of the products mentioned in areas where it cant possibly be due to populations of resistant weeds. I think during some springs the herbicides were applied when the ryegrass just wasnt awake enough yet.

 

[Lukehaynes]

Getting it tested is a must.

Is it all over fields or just patches that can have glyphosate pre harvest without too much loss?

Rye grass is arguably harder than BG as it germinates pretty much throughout the year rather than BG in autumn and spring.

 

[warksfarmer]

I'd be very grateful for some advice on how to deal with resistant rygrass.
It was suspected 2 years ago when a few patches in wheat weren't killed by spot application of Broadway Star, but at the time it was thought that this could have been due to the size of the plants. Last year in linseed rygrass was uncontrollable. In hindsight I should have destroyed the linseed/ryegrass to prevent seed return.
In the current wheat crop it had a pre-em of Trooper and Herald (pendimethalin + flufenacet + diflufenican) which didn't control it particularly well, and a spring application of Horus. The Horus knocked it back but it recovered.
Next crop will be osr so I'm assuming I'll get good control with Crawler and Kerb.
But what to do after that? It's got bad very quickly.

Broadway Star should come with a warning on the can that says ‘THIS PRODUCT DOESN'T WORK AND THE MANUFACTURER WILL FOB YOU OFF’

It’s complete and utter crap. It’s failed miserably for us 2 or 3 times now. We’ve got a bad ryegrass issue but historically Axial has worked for us. Hopefully again this year as well.

We don’t seem to see it come in osr, sbarley, pots, grass ley or maize. It’s bad in wheat though. Ploughing does not help. Stale seedbeds don’t help. Cover crops don’t help.

Permanent spring crops probably is the only option and way forward. We are seriously considering dropping wheat and doing a short term ley sown in September and then foraged April. Flip it into a spring crop and then so on. So two cash crops off the same land in the same farming year. Grass has done very well for us this year in the first field trial. It’ll give a similar gross output to a first wheat.

 

[yellow belly]

Silage

 

[colhonk]

Axil does not work for me, Put Broadway star on, on a do the job or do not pay for it

 

[deleted user 837354]

Ive killed ryegrass as tall as an A4 page with broadway star. It does work on susceptible weeds.

 

[yellow belly]

Looking to day at procam planted weed control plots
Not a lot hurts resistant ryegrass except glyphosate at more than 3 litres
IMHO 4 litres minimum
Then a spring crop

 

[deleted user 837354]

Looking to day at procam planted weed control plots
Not a lot hurts resistant ryegrass except glyphosate at more than 3 litres
IMHO 4 litres minimum
Then a spring crop

I've killed ryegrass with a lot less glyphosate than that.

 

[yellow belly]

I've killed ryegrass with a lot less glyphosate than that.

At lower rates resistance will develop as it has in Australia and the USA
Ryegrass will develop resistance far quicker then black grass

 

[Farmer Roy]

At lower rates resistance will develop as it has in Australia and the USA
Ryegrass will develop resistance far quicker then black grass

So I keep saying - but no one listens

But if you start using higher rates of glyphosate, you are just delaying / making the problem worse in the long term
Really need changes in chemistry, rotations & cultural practices