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Let's have a more advanced discussion about BYDV sprays

Clive

Staff Member
Moderator
Location
Lichfield
I want to see these crops that get no insecticides/no autumn fungicide/no slug pellets/no X,Y & Z etc., etc., someone give me some grid references!


your welcome anytime, we have many visitors every year now

it would be a gross exaggeration to say we use none of those products, they are just used a lot less over the last 7 years than they once were and in some cases omitted completely
 

shakerator

Member
Location
LINCS
We are at very nearly none now, 10/15% of what we used 5/10 years but that includes contract farming that we don't have compete agronomic control over

To be honest I take a very good look under a no till mulch a few weeks after a pyrethroid is applied and I see beetles spiders and insects galore and cannot tell the difference between sprayed and unsprayed.
 

Properjob

Member
Location
Cornwall
Claims that wheat drilled middle of Sept is riddled with virus, yields 4.5t/acre having had a spray?!? Yet field next door drilled without a follow up spray, yields 4.8t/acre is hardly scientific proof of zero tilling as a control of BYDV. Firstly crops riddled with BYDV tend not to yield quite so well, maybe after a fair crack down the pub. Once glyphosate is banned, probably ahead of Deter I would suggest, then with no method to control a green bridge of grass weeds and volunteers then I think a proper infection of BYDV may rear its ugly head pretty soon. Do not think you would find a single farmer in the mild SW that does take the risk of BYDV extremely seriously.
 

Louis Mc

Member
Location
Meath, Ireland
Meath is on the eastern side of the country, isn't it? What is your typical annual rainfall? Just trying to get an idea of how your area compares to Somerset/Devon/Cornwall in terms of aphid risk.
We are probably lower risk than you to be fair but it's easy find bydv most years. Some very bad crops locally
 

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Louis Mc

Member
Location
Meath, Ireland
Claims that wheat drilled middle of Sept is riddled with virus, yields 4.5t/acre having had a spray?!? Yet field next door drilled without a follow up spray, yields 4.8t/acre is hardly scientific proof of zero tilling as a control of BYDV. Firstly crops riddled with BYDV tend not to yield quite so well, maybe after a fair crack down the pub. Once glyphosate is banned, probably ahead of Deter I would suggest, then with no method to control a green bridge of grass weeds and volunteers then I think a proper infection of BYDV may rear its ugly head pretty soon. Do not think you would find a single farmer in the mild SW that does take the risk of BYDV extremely seriously.
I wasn't claiming anything, just adding some real life experience with actual figures agronomic details, which I think is what the op was looking for. btw "the green bridge" is a bit like a hypothetical agricultural boogie man (from my experience
Anyway)
 

Hindsight

Member
Location
Lincolnshire
Could find winged aphids easily this afternoon around Spalding in crops sown from early / mid October, of more importance emergence dates from 14 October through include 1 leaf crop emerged on 31 October. On one leaf there were two young non winged aphids.
 
I believe the issue is not finding aphids but the number of aphid preditors and the temperature experienced in the winter

if land has had regular insecticide applications then the risk that aphids landing in the crop survive till spring is higher than in fields that have not had insecticide for a number of years

we had sharp long frost last sunday white over at 9pm and freeze till 9 am on Monday not found aphids since
 

BenB

Member
BASE UK Member
Location
Wiltshire
Regarding the T-sum calculations, I guess I could sit down and work it out for myself, but surely it wouldn't be difficult to produce an app/website to help? Enter your location, drilling date, Deter/no Deter and it works it out for you?

Surely loads of local weather stations to take data from?
 

Brisel

Member
Arable Farmer
Location
Midlands
How do you do it? Average the max and min temperatures for each day like they do for the rolling average for sclerotinia prediction?
 

Heathland

Member
Arable Farmer
Location
Lincolnshire
@deleted user 837354
Will the crop be infected now if seed is not treated or been sprayed?
All wheat here is deter treated so not too worried,but a couple of years ago I bought some new seed in which wasn't treated just spd ,slip off the radar so wasn't sprayed and it got infected.
 

Properjob

Member
Location
Cornwall
Yes you are correct, but back to my original point it is not a simple discussion and obviously dependant on location. BYDV is a huge problem in Cornwall, is it in Berwick etc, then no?0 Why were seed potatoes traditionally grown in Scotland? You could do what you like in the far SW regards cultivation and insecticide stewardship, but failure to treat seed appropriately or spray twice or even three times would result in mass infection, no debate but fact!
 
@deleted user 837354
Will the crop be infected now if seed is not treated or been sprayed?
All wheat here is deter treated so not too worried,but a couple of years ago I bought some new seed in which wasn't treated just spd ,slip off the radar so wasn't sprayed and it got infected.

Hi mate

It is impossible to say, I don't know your area or local climate at all.

It all depends on when the crop was drilled and how aphid-favouring the weather has been. You can walk your crops and look for aphids if you wish but you have no clue if they are carrying the virus or not.

If you can travel I personally would be doing it now, in this area we can't afford to meddle with this stuff.
 
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Heathland

Member
Arable Farmer
Location
Lincolnshire
@deleted user 837354
Thanks for the reply,interesting comment my agronmist made the other day while asking if my seed was treated,quite a few of his customers have been caught out by opting for Redigo pro and omitting the deter part:banghead:
Like he said, it will be his neck on the line if it gets infected.
 

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