BYDV in wheat?

[Sonoftheheir]

We have these strange yellowy patches in some of our winter wheat. It's only in the wheat fields that weren't ploughed after spuds. We just subsoiled the fields and drilled with a combi. Same patches in the barley where the field was prepared the same way. Is it BYDV? If so how can it spread behind spuds when there is no "green bridge"?

 

[B'o'B]

It certainly looks like BYVD. Aphids fly and flew basically all winter this year.
A BYVD carrying aphid flew into your crop and multipled and the offspring spread to the nearby plants. Green bridge makes the risk of infection much higher and the infection will happen earlier and be more damaging, but no green bridge doesn't stop later aphid flights dropping in.

 

[Sonoftheheir]

My agronomist said the same,strange there's none in the ploughed fields? All the wheat went in within a couple of weeks.

 

[shakerator]

My agronomist said the same,strange there's none in the ploughed fields? All the wheat went in within a couple of weeks.

What was drilling date and was a pyrethroid applied if so when ?

 

[Sonoftheheir]

What was drilling date and was a pyrethroid applied if so when ?

27th October, no pyrethroid spray.

 

[clemmo]

Seed dressing?
Previous cropping?

 

[Sonoftheheir]

Seed dressing?
Previous cropping?

Austral plus and manganese. May of had a spd too?

All were previously spuds.

 

[clemmo]

What were the fields before potatoes ?

 

[Brisel]

Why Austral Plus seed dressing? Drilling was too early for the insecticide to help with WBF plus it shouldn't seriously affect a crop sown that early. Fair enough on a December/January sowing date.

 

[Sonoftheheir]

What were the fields before potatoes ?

Would have been WB or WW

 

[Sonoftheheir]

Why Austral Plus seed dressing? Drilling was too early for the insecticide to help with WBF plus it shouldn't seriously affect a crop sown that early. Fair enough on a December/January sowing date.

Black fen is very susceptible to WBF, had the Austral as I thought we needed it after spuds and s beet? Hadn't thought about it being too early, we have in the past been later drilling in Nov/Dec. Last field we drilled last year was at the end of Nov after s beet. No BYDV patches in there and it is next to a field with it.

 

[yellow belly]

the aphids can be blown so wind direction and field aspect can make a difference

the apids could have been in the field at ploughing time and field which were ploughed had apids controlled or were later emerging there will be a reason its a matter of identifying it

 

[Brisel]

Austral only provides a shield around the seed for wireworm & WBF, not a systemic insecticide that would protect against aphids like clothianidin (Deter). It's the Force part of the now banned Cruiser Force in beet. The Cruiser thiomethoxam neo nic gave the aphid protection in beet.

Asking a seed dressing to protect against WBF egg hatch in late Jan/Feb when it has been in the ground since late October is a bit too much to ask. Maybe keep the Austral for sowing after late lifted beet? I never used to treat seed going in after spuds in October - back then we still had Dursban if the crop looked a bit thin when egg hatch started & we couldn't afford to lose many plants. October sowing into the kind of soil that grows good spuds meant plenty enough tillers to withstand attack by Feb.

It's not easy to predict when you will be sowing after potatoes when it comes to ordering seed purchases but if you're on farm saved seed just boost the seed rate by 10%. It's much cheaper.

 

[Sonoftheheir]

We did have deter on a 2nd winter barley field,That has the patches (wasn't ploughed). The field next to it was ploughed and didn't have deter and that is fine.

 

[TelesnaAg]

Sure its not an N or Mn issue - with heavy spud growth in certain areas etc? hard to tell from pics that far away...

Ant...

 

[Sonoftheheir]

This is a neighbours field about 1/4 mile from ours, we had spuds on there last year too.

 

[Badshot]

Got bydv showing in crusoe when I was doing the T3 today, none in skyfall. All deter treated and drilled within a few days early October.

 

[jed]

We have these strange yellowy patches in some of our winter wheat. It's only in the wheat fields that weren't ploughed after spuds. We just subsoiled the fields and drilled with a combi. Same patches in the barley where the field was prepared the same way. Is it BYDV? If so how can it spread behind spuds when there is no "green bridge"?

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Looks like it .
Had a similar thing about three years ago 1st wheat after spuds flat lifted then drilled mid October ,Diego single purposed dressed averaged less than two ton across 120 ac disaster.
1st wheat in next field same seed and dressing sown a week earlier did four ton only difference been the field was ploughed.
Have deter dressed all wheat since other than late drill after fodder beet.
But yours doesn't look as bad as our did if that helps.

 

[Honest john]

We have these strange yellowy patches in some of our winter wheat. It's only in the wheat fields that weren't ploughed after spuds. We just subsoiled the fields and drilled with a combi. Same patches in the barley where the field was prepared the same way. Is it BYDV? If so how can it spread behind spuds when there is no "green bridge"?

View attachment 327030 View attachment 327032

You are not on your own. I have a field drilled at the same time that's quite bad.
I am very lucky that I had most of my seed with Deter dressing. Even that has some mild patches in it. Some mild patches in Dec drilling as well.

In fact the odd fields that have not been treated with Gly either have BG BYDV YR or all three.

 

[Honest john]

You are not on your own. I have a field drilled at the same time that's quite bad.
I am very lucky that I had most of my seed with Deter dressing. Even that has some mild patches in it. Some mild patches in Dec drilling as well.

In fact the odd fields that have not been treated with Gly either have BG BYDV YR or all three.

Forgot to say not my fields. But I have seen some shocking wheat fields today. What little bit of wheat you can see under the carpet of BG looks red yellow & blue.