BYDV or cold/stress!!!
- Thread starter Bigjon44
- Start date
ollie989898
Member
You may find BYDV foci in a crop at this time of year. I wouldn't worry about the above though.
Looks likely to be late infection BYDV to me, not much you could have done to stop it. It shouldn't effect yield any where near as much as early infections
I wouldn't be surprised if that wasn't even spring infection.Yeah hoping it's just a mild, late case of infection. Can they infect anytime then if it stays mild or usually October isn't it ?
Reading somewhere that pyrethroids only last about a week anyway so could well be spraying 4,5 times or more
If spring infection seed treatment would have long gone by then. One year I had 75% of wheat are deter treated and 25% untreated. I had a few patches of BYDV a lot like in your pictures, but interestingly only in the deter treated fields!
Bigjon44
Member
Yeah I suppose so,dressings only last a certain number of weeks.how do you monitor it in spring then?go with an insecticide in with T0,T1??!!
No point, in my opinion you just have to live with it. As said above it shouldn't effect yield massively. How many patches do you have and how big an area?
yellow belly
Member
- Location
- south west lincolnshire
Not likely to be bydv
circles not lines unless emergence was in lines several weeks a part
very early infection Did course whole field to be infected but in the 1980s drilling before 10 September
and aphids easy to find
circles not lines unless emergence was in lines several weeks a part
very early infection Did course whole field to be infected but in the 1980s drilling before 10 September
and aphids easy to find
whitefox
Member
- Location
- central scotland(the very wet bit)
i assume this picture was taken post emergence autumn 22?,but it looks exactly like late sown spring barley,that i was spraying with trace elements tonight,it looked dire 10 days ago,but with some higher temperatures, now seems to be perking up,are the darker crop rows,the drill tractor wheelings?
How much sulphur has it had? The reddening hints a phosphate deficiency, but is it because the soil is short on phosphate, or (as is more likely) the plant roots just can’t take it up for some reason. Your second set of photos hints a possible manganese deficiency, does your land have a history of that? Did you apply any manganese?
No way is that bydv showing at that growth stage, you got other problems that can’t be sorted by seed dressings or insecticides.
Bigjon44
Member
Yes 25th October, had a contractor do it and think it went in a bit too deep nearly 4 inches in places.was in spuds previously so would of thought had plenty of nutrients left in from the spud fert unless the spuds extracted more last season in the hot and irrigation. Has gone bone dry here last 3 weeks after being very wet so probably hasn't helped root uptake.been applying 3L mang and mg every pass
Bigjon44
Member
Need a soil test?