If you're going to spray there are much better products that cyper thats for sure
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Let's have a more advanced discussion about BYDV sprays
- Thread starter Feldspar
- Start date
If you're going to spray there are much better products that cyper thats for sure
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
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.
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.
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
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
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)
yellow belly
Member
- Location
- south west lincolnshire
Frost this week will have knocked them
Reduced the slugs too no treatment
And 1 leaf bg killed
Ina field to day worked by crows not much gets past them
Not used a Bydv spray since the early 1990s
And not seen bydv that cost more than 1 years spay in all that time
Inunsprayed field the beneficials will clear up the fewaphid that survive the weather
Reduced the slugs too no treatment
And 1 leaf bg killed
Ina field to day worked by crows not much gets past them
Not used a Bydv spray since the early 1990s
And not seen bydv that cost more than 1 years spay in all that time
Inunsprayed field the beneficials will clear up the fewaphid that survive the weather
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.
- Location
- Worcestershire
Winged Aphids found at will non deter dressed 1 leaf wheat. Couldnt find any on deter treated fields.
yellow belly
Member
- Location
- south west lincolnshire
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
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
deleted user 837354
Member
IME aphids are not killed by frosts.
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?
Surely loads of local weather stations to take data from?
Read your latest weekly TAG update 
@jamesthomas1989 Surely this would be a perfect Syngenta project, or would it reduce Hallmark sales!!
EDIT: Sorry, its an opportunity for Hallmark stewardship!
@jamesthomas1989 Surely this would be a perfect Syngenta project, or would it reduce Hallmark sales!!EDIT: Sorry, its an opportunity for Hallmark stewardship!
- 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.
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.
yellow belly
Member
- Location
- south west lincolnshire
In your locality that is likely. Temperature for Minehead is 3 to 5 c higher than for here
It can easily be tested put aphids in the freezer and see how many survive
If frost does not kill them then for the last 25 years the aphids round here have either had no bydv or the benificials control them
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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
Member
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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- 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
Like he said, it will be his neck on the line if it gets infected.
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
Like he said, it will be his neck on the line if it gets infected.