Cereal growers are being asked to safeguard the efficacy of aphicides by reporting control failures and sending off aphid samples for resistance analysis.
The request forms part of a UK aphid-monitoring programme, part-funded by AHDB, which looks to detect emerging resistance issues so they can be tackled before they become an established threat to UK cereal production.
Rothamsted Research, which conducts the aphid screening work, is particularly looking for live field samples of bird cherry–oat aphid that unexpectedly survived treatment with insecticides this autumn.
Dr Stephen Foster at Rothamsted Research, who leads the aphid resistance monitoring project, said: “Our focus this autumn is bird cherry–oat aphid. Although there is no known insecticide resistance in UK populations of these aphids at present, the potential for resistance exists, so we must monitor the situation closely.”
Bird cherry–oat aphid is one of the main vectors of barley yellow dwarf virus (BYDV) in cereals and can also transmit non-persistent viruses, such as Potato Virus Y (PVY), in potato crops.
Picture source: ADAS
Bird cherry–oat aphids are green to dusky brown, with rust red patches at the rear. Adults are 1mm long and oval shaped.
In cereals, BYDV is most damaging when young plants are infected in the autumn. Infections cause leaf yellowing and stunting of plants, often developing in distinct circular patches in the crop.
How to post live samples:
For more information visit: cereals.ahdb.org.uk/aphidmonitoring
Source: AHDB Cereals and Oilseeds