Bruchid beetles are now active in field bean crops, particularly winter beans that are flowering, according to PGRO.
When the pods on the bottom trusses of the bean plant are 2cm long and temperatures exceed 20 deg C for two consecutive days, growers are advised to apply an insecticide spray to prevent bruchid beetle damage.
The Syngenta BruchidCast forecasting service predicts when the temperature threshold has been reached and indicates suitable conditions for applications.
The BruchidCast is currently indicating that the temperature threshold will be reached on May 26 in some parts of the UK.
Dr Max Newbert, Syngenta field technical specialist says: “Crops with no trusses present as yet do not need treating, but with the first warnings at such an early stage of the crop’s flowering and set, it could prove a long season for bruchid activity.”
Sign up for the Syngenta BruchidCast forecasting service by going to www.syngenta.co.uk/bruchidcast.