Cabbage stem flea Beetle larvae on OSR crops

[John Slejpner]

Agree with Brisel, i would not give that more than 120kg N total....maybe less if your soil as fertile as it looks .
And nothing more until 3+ litres of pre-harvest glyposate to floor the clatter of BL weeds that are yet to come (probably)
I will be delighted for you if that does 1.5 t/ha. My version of similar last year scraped a tonne.

Plenty of similar enough crops around here, and some of these have very recently been sprayed off.

How is combine capacity? Because that will likely be fit after or same time as mainstream early wheat like Skyfall.

If you are one of those near 7 tonne spring barley growers i would definitely "plant" a few handfuls of seed now, and check progress in 2-3 weeks. It is drier than this time last year, but also much milder and my guess is propyzamide is long gone as far as germinating barley is concerned.
You might be glad of the option.
Sorry.

 

[robbie]

Id go with the reduced N approach too. The plants have got plenty of room to branch out and will likely resemble oak trees after flowering.

Just a thought but if you reduce the N now and after flowering decide the crop has after all got the potential to perform them you could apply 200 lts of a omex osr extra type produce to bring N up to the original planned level.

 

[Flat 10]

have known mowed around 250acres, so I sit back with abated breath !

Thanks for the responses people. How’s your trial gone 8530?

 

[Wombat]

View attachment 776864 View attachment 776866 View attachment 776868 Ok opinions please, does this deserve a second main dose of N plus S or is it kaput? Decent roots but several plants killed since first dose. Growing point completely gone on this typical example. @Feldspar is not sure. Agronomist says reduced N and foliar feed. What does TFF collective think?

We had some similar and for me I would drop the N rate and hope we get a kind spring. Last year we didn't and ours did 0.5t/a. So fingers crossed but I wouldn't spend too much on it

 

[Flat 10]

It’s so frustrating. When I put it in I was hoping for a modest 3t/ha but I won’t get half that probably. Established nicely and nothing really spent until astrokerb. And as @John Slejpner says this makes the replacement crop issue a bit harder. You have all said leave it in the ground anyway which is helpful.

 

[John Slejpner]

It’s so frustrating. When I put it in I was hoping for a modest 3t/ha but I won’t get half that probably. Established nicely and nothing really spent until astrokerb. And as @John Slejpner says this makes the replacement crop issue a bit harder. You have all said leave it in the ground anyway which is helpful.

Actually.. I was trying to suggest that you almost certainly DO have a re-drilling option.
I sprayed off 30% of my OSR post beast from the east last year, planted 280kg FSS barley with a Claydon mid April, it yielded bang on 5 t/ha with one fungicide.
Missed malting by a tiny N fraction, sold £170 sept, Straw stayed locally at a low (sensible) price.

I wish i had sprayed and re-drilled the lot.
On medium and heavy clay here, and for some reason (actually nice top tilth with barley) WW following barley slightly superior to that following OSR.

You can grow 7t/ha barley IIRC...my agronomist would have you spray that off first calm day.( Assuming plant in your hand is anyway typical)
A plant in which CSFB has wrecked the growing point area is NOT the same as one in which a pigeon has nipped the top off. It will NOT branch off the bottom.

I cannot advise you to spray that off. That has to be your call.
But I can tell you that i would have the barley sample planted, and when its growing fine in 2 weeks, then I would spray and redrill assuming the OSR plants have not suddenly "got on with it". Which i am pretty sure they are not going to.

If it was my field.
And yes, strange things happen, and it might be the wrong call but i honestly don't think so.

 

[Brisel]

Barley is not a break crop.

 

[Trigger Happy]

getting slaughtered by csfb lavae now, just wont grow away. This is far worse than
autumn failure, was hss but apart from that a bloody disaster.

I'M OUT!!

 

[average farmer]

Been through the rape with the spinner today and found a few larvae had made it into the stem of the plant now. I’m sure the others still in the branches will be there soon to.

Put this together with pigeons and the fact my osr after spring barley looks shockingly poor in any sprayer overlaps and not much better in the field I can’t see my average being over a tonne this year.

Most crops look good off the road, get in the field it’s a different story.

 

[principal skinner]

View attachment 776864 View attachment 776866 View attachment 776868 Ok opinions please, does this deserve a second main dose of N plus S or is it kaput? Decent roots but several plants killed since first dose. Growing point completely gone on this typical example. @Feldspar is not sure. Agronomist says reduced N and foliar feed. What does TFF collective think?

That’s not much better than what I ripped up this week and drilled with spring barley off the heap. Straight in with the drill, 150kgs N on already. Hopefully two passes with the sprayer will see it to harvest.

Really pee’d me off doing it, but two days later I’m a lot happier as I’m not looking at shite rape!

 

[MrNoo]

Cut open quite a few stems after being sprayed off two weeks ago while drilling SB straight into it with a Vaddy and couldnt find one stem without larvae in them, some just the odd one or two and others 8+, as above, much happier now.
No OSR here next year.

 

[Try to succeed]

Just catching up with this thread... never seen this issue in Notts before and I’m having a nasty shock. Anywhere my osr is next to woodland there is an issue. Some fields look absolutely perfect, then others started with small areas struggling and now it is spreading in a wave up the field as the healthier plants succumb. Not a massive % of my acreage but a bloody good warning. There are also weevil in there with the csfb larvae. Coincidentally these are the fields that had the least pressure in autumn

 

[Rookie]

Finding quite a lot of stem weevil in some of ours. (Mentioned a few weeks back in another thread, as at the time could be confused with CSFB larvae)
One field I was at the point of ripping up but have decided to leave and see what becomes of it.
Also in Notts.
Agronomist hadn't come across them before.
Seems worse where soil is sandier.

 

[Try to succeed]

Finding quite a lot of stem weevil in some of ours. (Mentioned a few weeks back in another thread, as at the time could be confused with CSFB larvae)
One field I was at the point of ripping up but have decided to leave and see what becomes of it.
Also in Notts.
Agronomist hadn't come across them before.
Seems worse where soil is sandier.

Mine doesn’t seem to be soil dependant. One of my few lighter fields is hit, as is some of the rankest clay. Agro viewing on Monday so I’ll have a chat and see if weevil has been an issue for anyone else nearby. Was planning on adding liquid kit to my osr drill this time but think it’s not worth the investment now

 

[robbie]

As previously mentioned on this or another thread. I had a cock up with the autumn fert on one piece of rape where the 4-6 m between the tramline got far more and the area behind the tractor had considerably less.
The crop looked cracking and very even up to Christmas when the under dosed areas started to yellow and older leaves died away.

As soon as I could travel in Feb I tried to correct the problem but what I'm seeing now is the areas which received the least fert and poorer areas where the sprayer overlapped have beetle larvae in the crown but the areas which stayed healthy have non. I'm wondering if CSFB attacks could be related to crop nutrition.

Id like to see a some research done into crop nutrition levels and susceptibility to csfb and stem weevil.

 

[Case290]

Think this is new to every one including me. Shocking disaster with my osr completely destroyed the growing point. Just to top it of pollen Beatles 39 per plant working on the few green buds which are there agronomist said no insecticide. (Really unsure )never ever seen so many.

 

[Green oak]

Just catching up with this thread... never seen this issue in Notts before and I’m having a nasty shock. Anywhere my osr is next to woodland there is an issue. Some fields look absolutely perfect, then others started with small areas struggling and now it is spreading in a wave up the field as the healthier plants succumb. Not a massive % of my acreage but a bloody good warning. There are also weevil in there with the csfb larvae. Coincidentally these are the fields that had the least pressure in autumn
View attachment 782640

 

[Green oak]

The oil seed rape jobs done.

 

[yellow belly]

In the 80s had mid August planted rape with carrot root fly
Also then larvae were the bigger problem adults did little damage

 

[yellow belly]

The oil seed rape jobs done.

When every one around stops growing rape then time to get back in as flea beetle numbers will reduce if there is no rape