Evidence of infection in mid October drilled WB, don’t want secondary infection but guess given temperatures and low aphid forecast not worthwhile/not not good for environment. Conflicting advice from agronomists. Not treated in the autumn if that makes a difference. Anecdotally I find hybrids seem less affected than the malting varieties we grew years ago. ie visible infection doesn’t lead to as significant a yield loss
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BYDV spring treatment?
- Thread starter Flat 10
- Start date
Infection might have occurred prior to mid-February but spraying for aphids now is futile and/or not required for most situations. I would work on the principle that the cold spell in mid-February was sufficiently lethal for most aphids in most parts of the UK.
Barley crops won't take long now to reach GS31 at which point any new/late infection will be tolerable.
Would be interesting to know what info the agronomist who is more pro-spraying insecticide has based his opinion on?
Temps from RAF Marham... quite a few frosts to do the bird-cherry oat aphids and then some real bangers in early-mid February to sort out grain aphid.
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- Location
- the brecks norfolk
I have what looks like quite bad BYDV in one particular field of barley drilled 29th September, there's a distinct like where the rest of the field was drilled a fortnight later.
It had a autumn BYDV spray but not until mid November. The damage is done, I won't be spraying it again as said above it'll soon be past the worst infection stage and the cold should have done for any aphids still lurking in the crop.
It had a autumn BYDV spray but not until mid November. The damage is done, I won't be spraying it again as said above it'll soon be past the worst infection stage and the cold should have done for any aphids still lurking in the crop.
- Location
- the brecks norfolk
Been doing MN today, it's seems worse than normal this year which I'm putting down to not being rolled after drilling in the autumn.