Bean crop being sprayed© Tim Scrivener
In 2015, testing carried out by Rothamsted Research and the PGRO confirmed pyrethroid resistance in the pea and bean weevil. PGRO technical officer Becky Ward says the work confirmed strong or partial resistance to pyrethroids on a number of sites in the east of England (see map below). Pulse growers have had to rely on pyrethroids as the only chemical means of controlling weevils since the early 1990s, when systemic organophosphate insecticides were banned. That reliance has resulted in resistance […]