As well as the possible use of a neonicotinoid seed dressing for the 2021 season, there are additional changes to aphid control programmes.
The insecticide InSyst (acetamiprid) from Certis has received full authorisation for use on sugar beet crops to help combat virus yellows.
Last year it was granted emergency approval which meant due to Defra restrictions, Teppeki (flonicamid) had to be used first.
However, now the insecticide has received full approval, InSyst can be the first spray in the programme Prof Stevens said.
At the time of writing, industry was still awaiting confirmation from CRD regarding whether InSyst could be used alongside the Cruiser SB (thiamethoxam) neonicotinoid seed dressing if the Rothamsted aphid threshold was triggered.
However, with some 50% of growers estimated to have ordered untreated seed, it will still play a valuable role this season in keeping aphids at bay.
Laurence Power, technical manager at Certis said: “InSyst provides rapid knockdown, which is very useful early in the season to prevent early virus build up, which has the greatest impact on yield.”
Mr Power advised growers use BBRO/Rothamsted and Warwick University’s aphid monitoring services to keep track of aphids in the local area.
“As soon as you hit that threshold of one green wingless aphid per four plants before reaching 12 true leaves or one per plant from 12-16 true leaves then it’s time to spray.
“The rate of application should not be lower than specified to ensure good control and to prevent the likelihood of resistance build up.
For the best efficacy, make sure you check your water quality too – insecticides in general do not like hard water.”
The latest timing of application is 28 days before harvest.
Following an application to sugar beet between BBCH 12-19, InSyst must not be applied to the same field until the second spring, regardless of crop.
InSyst offers around 14 days of protection, depending on the weather.
If the threshold is met again, growers also have the option of one application of Teppeki.
BBRO is also working with NFU Sugar and British Sugar to submit an application for emergency authorisation of a third aphicide, particularly for crops that have not been treated with Cruiser.