The bird cherry-oat aphid, Rhopalosiphum padi (L.), is the major aphid pest in spring cereals in Finland. It is also the vector of Barley yellow dwarf virus (BYDV) which is the most serious virus disease of cereals.
The Finnish forecast of R. padi is based on egg counts on the winter host.
The effects of no-tillage on aphid abundance have been variable
