Growers of winter barley, wheat and oats are being urged to be on the lookout for aphids that can carry damaging infections of BYDV.
Winter barley growers, as well as growers ofwinter wheat and oats, are being urged to be on their guard for aphids thattransmit barley yellow dwarf virus (BYDV) infection, following the early startto drilling this autumn.
The earlier that crops emerge, the longerthey are exposed to risks of BYDV infection, says Syngenta field technicalmanager, Iain Hamilton.
Moreover, risks could be heightened in cropsthat havent been protected with a suitable insecticide seed treatment, hepoints out.
Similarly, where lower seed rates have beenused for example to take account of early drilling it is possible thatinfection levels can increase even if a seed treatment has been used, MrHamilton explains.
Once cereals crops have emerged, it will beimportant they are monitored closely, says Mr Hamilton. Warmer conditionswill also encourage aphid activity.
Where a risk is identified, be prepared toapply an insecticide spray, such as Hallmark Zeon where appropriate.
That said, growers should note that strainsof grain aphid have been found which are resistant to pyrethroid chemistry. Soin these situations, alternative products may need to be considered, he says.