- Location
- West Suffolk
I thought BYDV showed up red in oats?
My barley is much worse
They are purple, unfortunately.
Bugger
- Thread starter Kam
- Start date
They are purple, unfortunately.
- Location
- Limousin/Charentes toad land
Thinking ahead...
Is there any problem using obviously infected crop for next years FSS?
Is there any problem using obviously infected crop for next years FSS?
- Location
- West Suffolk
No, it will be fine
Hindsight
Member
- Location
- Lincolnshire
BYDV not seed borne. BYDV virus survives in living plant tissue. So usually in grass as well as cereals. The vector which moves it from grass to cereals and then within cereals between plants is aphid.
yellow belly
Member
- Location
- south west lincolnshire
There are 2 ways aphid get in the crop
fly then breed
or walk from previous grass cereal crop this can be the worst cases and affect later drilled crops
ploughing in grass and drilling straight after the worst along with pre 15 September emerged seen in the 1980s
in my view first cereal after a non grass crop is a lower risk than second cereal
altitude and field aspect also has a influence on risk
a sheltered warm field can be affected but open exposed fields clear
spraying can prevent it but not always I have had small areas in sprayed field but in the same year unsprayed unaffected fields
fly then breed
or walk from previous grass cereal crop this can be the worst cases and affect later drilled crops
ploughing in grass and drilling straight after the worst along with pre 15 September emerged seen in the 1980s
in my view first cereal after a non grass crop is a lower risk than second cereal
altitude and field aspect also has a influence on risk
a sheltered warm field can be affected but open exposed fields clear
spraying can prevent it but not always I have had small areas in sprayed field but in the same year unsprayed unaffected fields
Exfarmer
Member
- Location
- Bury St Edmunds
Aphids everywhere at the moment in my garden , predators have not woken up yet.
Mr Charisma
Member
- Location
- stratford on Avon
I was lambasted a couple of years ago for spraying a insecticide for bydv ,,,,,,,,, I've always said that those who don't believe in the bydv fairy has never spent a day cutting 80 odd acres and only filled a couple of trailers
- Location
- Limousin/Charentes toad land
i guess for this year, Mark, you are talking spring crops. I read one article that for a one off spray, gs14, which strikes me as late. What do you think?
Many that do harp on about it are in the eastern counties where the risk is far lower than it is over here in the west country.
Mr Charisma
Member
- Location
- stratford on Avon
Going to put a bit of mang on this next week , will possibly do a Bydv then
- Location
- Limousin/Charentes toad land
Mr Charisma
Member
- Location
- stratford on Avon
2 leaf
- Location
- Limousin/Charentes toad land
that’s my thinking, 4 leaf seemed late to me.
Maybe a second added with pgr then...
But paranoid as I have lots of patches in winter cereals, of course very wet and mild November
- Location
- West Suffolk
Following on from my original post, this is the effect of BYDV on the biomass of the oat crop in my photograph.
First image is from 8th April, just when I was just beginning to notice virus. Circled in red
Second picture is from 26th April. Very telling........
First image is from 8th April, just when I was just beginning to notice virus. Circled in red
Second picture is from 26th April. Very telling........
renewablejohn
Member
- Location
- lancs
That would have been my thoughts.
- Location
- West Suffolk
Quite likely I expect. The field to the right was drilled the same day and there is no sign of it there at all.
Hindsight
Member
- Location
- Lincolnshire
Not a good picture afraid but a good example that BYDV does exist and exist widely in the general grass environment.
The wheat in this picture was sown 18 September 2019 and was emerged around early October. Due to the wet weather the field did not receive a pyrethroid until January 15th.
In this particular field there is no BYDV foci in the crop suggesting limited aphid flights on this particular field, though there is on two other fields, smaller and sheltered with hedges, a mile away, which have definable foci, albeit small size about a metre circle.
However, along one side of the field is an area of 0.6 hectare grass - to right in picture. And now a band of BYDV in the wheat plants adjacent to that grass strip - so during the autumn aphids walked off the grass into the wheat - albeit only a few cms. And there was a flight out into crops as evidenced by the other fields, but possibly not on this large (55hectare) exposed field.
But these examples indicate that BYDV is present in the cereal / grass environment around Lincoln. And as such a threat to September sown crops in that area.
Epidemiology of BYDV and autumn aphid very fascinating.
The wheat in this picture was sown 18 September 2019 and was emerged around early October. Due to the wet weather the field did not receive a pyrethroid until January 15th.
In this particular field there is no BYDV foci in the crop suggesting limited aphid flights on this particular field, though there is on two other fields, smaller and sheltered with hedges, a mile away, which have definable foci, albeit small size about a metre circle.
However, along one side of the field is an area of 0.6 hectare grass - to right in picture. And now a band of BYDV in the wheat plants adjacent to that grass strip - so during the autumn aphids walked off the grass into the wheat - albeit only a few cms. And there was a flight out into crops as evidenced by the other fields, but possibly not on this large (55hectare) exposed field.
But these examples indicate that BYDV is present in the cereal / grass environment around Lincoln. And as such a threat to September sown crops in that area.
Epidemiology of BYDV and autumn aphid very fascinating.
Attachments
yellow belly
Member
- Location
- south west lincolnshire
avoiding spraying for bydv in the autumn
is a balance between drilling date/emergence date exposure of the field
previous crop and the amount of aphid preditors
18 September is early and high risk
sheltered fields woodland can protect a field from aphid killing weather
previous crop grass or a cereal can harbour bydv aphids brassicas habour non bydv aphids
full cultivation reduces the number of aphid preditors
in 2019 if I had known the weather would have made drilling impossible after 23 September I would have drilled a week earlier
did drill 20 to 23 septemebr and have no perceptible bydv a week earlier and crops could have had a lot more
no till fields with half after osr with full regrowth of rape sprayed off a week after drilling the rape takes 2 weeks to die so the incoming aphid land on rape plants and then move on to another field as they cannot find a cereal many preditors on the ground reducing any that stay
cold area with all fields above 400 ft this slow aphid development
2019 autmn wet and cold
it is possible with extensive crop inspecting to find aphids if they are present and treat acordingly although my eyesight is not as good as it was 30 years ago but as the insecticide is so cheap reducing aphicide is not high up farmers priority
this is coming back to bite use the reduction in inscects is getting constant attention consequently we can no longer grow some crops and have to put up with some pests as they are uncontrolable
chemical companies are not going to develop new inscecticide as they will not get registered
we should be using all the cultural controls possible
later drilling on sheltered low lying freer draining fields
build up beneficials reduce grass to cereal or cereal to cereal green bridge
is a balance between drilling date/emergence date exposure of the field
previous crop and the amount of aphid preditors
18 September is early and high risk
sheltered fields woodland can protect a field from aphid killing weather
previous crop grass or a cereal can harbour bydv aphids brassicas habour non bydv aphids
full cultivation reduces the number of aphid preditors
in 2019 if I had known the weather would have made drilling impossible after 23 September I would have drilled a week earlier
did drill 20 to 23 septemebr and have no perceptible bydv a week earlier and crops could have had a lot more
no till fields with half after osr with full regrowth of rape sprayed off a week after drilling the rape takes 2 weeks to die so the incoming aphid land on rape plants and then move on to another field as they cannot find a cereal many preditors on the ground reducing any that stay
cold area with all fields above 400 ft this slow aphid development
2019 autmn wet and cold
it is possible with extensive crop inspecting to find aphids if they are present and treat acordingly although my eyesight is not as good as it was 30 years ago but as the insecticide is so cheap reducing aphicide is not high up farmers priority
this is coming back to bite use the reduction in inscects is getting constant attention consequently we can no longer grow some crops and have to put up with some pests as they are uncontrolable
chemical companies are not going to develop new inscecticide as they will not get registered
we should be using all the cultural controls possible
later drilling on sheltered low lying freer draining fields
build up beneficials reduce grass to cereal or cereal to cereal green bridge