Hindsight
Member
- Location
- Lincolnshire
How can bydv be worse in ploughing, than when you drill into a living green bridge, this unseasonably mild early winter with plenty of early Oct drilled crops ought to tell a story, come summer.
More so with all the growers who have been declaring that they were finished with insecticides.
Connected to nitrogen levels in the plant that allows the aphids to detect them easier.
Aphids as a vector of BYDV will be from two sources. Those already in field - green bridge and those that fly in following wheat crop emergence. Aphids see in the infra red spectrum. And direct drilled fields tend to have trash / stubble etc left visible after sowing. Ploughed land tends to be bare with just the sown cereal emerging and standing alone. A cereal plant or surface stubble / trash will all look to an aphid varying shades of red. Thus an aphid is 'confused' by the trash. In a ploughed field with just cereal there is no 'confusion'.
This technique is being developed in the potato world as a means of reducing virus in seed potatoes. Field scale experiments scattering straw over the potato ridges after planting through which the young potato plants emerge.
This is a separate mechanism to any issue with leaf nitrogen. I would contend it is possibly more important than the leaf nitrogen focussed on by advocates of direct drilling.
Fascinating.