Redigo or Redigo Deter? Few weeks is quite a long time and certainly would mean crop begins to be at risk again even if treated with Deter.
The whole problem with BYDV is the data on yield effects from infection is pretty much non-existent. It's a case of balancing a harm to beneficials against some possible large / possibly not large effect.
Yes, fair enough. That's another gripe I have. Even if I did have average yield impacts, or some averaged relationship between observed aphid numbers in the autumn against predicted yield effect, I would have no idea how much to bump the expected yield hit down given that I am in East Anglia and 120m above sea level in big open fields. It's like stabbing in the dark.
is there any know resistance in aphids to pyrethroids ?
I will be spraying here have found aphids and average temps being high they will pop out kids and grandkids fast
I don’t think the effect on beneficial is that high if you have a good residue cover on the topsoil
NoDid you treat with Deter?
Would an aphid even be able to fly into the crop in this wind?