Root issues in DD OSR

[Wigeon]

Just been out and pulled some Barbados and saw this in every stem. The plant looks fine visually, is growing well, and there whilst there are some csfb larvae in the lower peteoles, they aren't in the stems. The stems are unblemished and healthy above the root, but as soon as you split the top of the root you see this. There is no obvious insect entry.

The crop was scratched into stubble with a horsch sprinter and established well, though some roots have had to work fairly hard.

I have some extrovert in the neighbouring fields that went in with the Mzuri which show little or none of the problem, so is it an issue of variety, or establshment, both, or something else. The soil is clay with flints.

Any ideas on what it might be and whether I should be worried would be greatly appreciated - it started out as quite a nice walk!

Many thanks.

 

[AG Tim]

Iam not sure, i think i see some kind of damage that is similiar or beginning here too.

I think its a lack of boron or boron availability, not sure if its depending on pH, the very dry autumn or maybe some kind of antagonism between some outweighing nutrients that cut the boron availability for the plant.

The "hole" in the stem could lead to colonization by insects? Early snout Beatles/weevels?

That is osr from our site, got 2x 320g boron with the sprayer in autumn.

 

[Wigeon]

Interesting re boron - this had 225g boron in one spray with plover in the autumn. Recent leaf analysis suggests boron is sufficient, though K was low at the time of sampling (done before MOP was applied).

I agree with you re insect colonisation - it must be a risk.

 

[Wigeon]

the crop looks like this though, so no visible signs of stress etc:

 

[franklin]

Is the browned part of the root above the ground? have you cleaned the soil off, as I am finding it tricky to tell if the browned section of plant has lay below the soil surface, or above it?

 

[Wigeon]

It's pretty much at the soil surface or just above it.

 

[AG Tim]

Yes, a week ago i thought the plants are looking fine from the far. Now, with the boron case in mind its more and more obvious, even with a short look from the distance. Leaves with red colored edges (which i thought it could be also a viral desease), plants looking more and more like salad with little leaves under older ones, which wont make flowers. The stems are dry now,even with this growth damage , but i think with ongoing dryness these holes will become soft and rotten.

So i think next week we have to decide if a insekticide against weevels or pollenbeatle is needed - now I think its not, seems they are supressed anyway - so we would spray boron solo - seems strange but i think its necessary in our case.

 

[franklin]

It's pretty much at the soil surface or just above it.

Ah, so you have a chunk of root in the ground which is fine; then an inch or so out of the ground, and then the cluster of leaves? Yes, I have seen this in OSR we slot straight in. It's the gap between the bottom of the leaves and the surface of the soil, which is susceptable to frost. It looks to me like boron, but you really want to try and get as little gap as possible from the top of the root to where the leaves splay out. But I wouldnt rule out frost damage either.

 

[York]

Iam not sure, i think i see some kind of damage that is similiar or beginning here too.

I think its a lack of boron or boron availability, not sure if its depending on pH, the very dry autumn or maybe some kind of antagonism between some outweighing nutrients that cut the boron availability for the plant.

The "hole" in the stem could lead to colonization by insects? Early snout Beatles/weevels?

That is osr from our site, got 2x 320g boron with the sprayer in autumn.

Nitrate N is besides B the "cause", from our experience.
When dry & wet autumn this amount of B is hardly scratching the surface.
When you have a larvae, do your own trial with a >2x B foliar application & look 24h later how the larvae is doing.
Use Boric Acid (17.4%B) as it's a soil & tissue active B. The benefit is it lowers the pH in the water so half life of pyretides is increase even. Boric Acid should be <1,- €/kg.
York-Th.
p.s. if you are "brave" you apply boric acid regularly until the plant has "healed" itself ;-)

 

[Wigeon]

Ah, so you have a chunk of root in the ground which is fine; then an inch or so out of the ground, and then the cluster of leaves? Yes, I have seen this in OSR we slot straight in. It's the gap between the bottom of the leaves and the surface of the soil, which is susceptable to frost. It looks to me like boron, but you really want to try and get as little gap as possible from the top of the root to where the leaves splay out. But I wouldnt rule out frost damage either.

Thanks- yes, that's about right. Will check boron again, but that aside, I presume there's not much that can be done about it? Any ideas on how to stop it happening again? It went in with 1inch Dutch openers with the seed just covered- perhaps deeper would be better?

 

[franklin]

No idea. Have seen it here this year where we have drilled OSR into a bit of game cover to straighten up a field. However, as we used last years' tramlines, the bit in the cover did not get any spray on it and there is a lot of exposed root collar. Elsewhere we have slopped on the teb to keep it flat to the floor. I'll try and have a look tomorrow and see if we have any damage in the unsprayed bit.

 

[Wigeon]

Thanks - yes, opinion this end seems to be insufficient boron in the autumn, which is now a little academic. Barbados it would seem is more sensitive to it than extrovert, but i'm still not sure what role establishment played, if any.

 

[York]

Thanks - yes, opinion this end seems to be insufficient boron in the autumn, which is now a little academic. Barbados it would seem is more sensitive to it than extrovert, but i'm still not sure what role establishment played, if any.

not toooo late jet to take action & help plants.
York-Th.