Spring beans can still be protected from late-season epidemics of chocolate spot and rust if growers use a strong dual-purpose protectant fungicide as the final spray.
That view was put forward by manufacturers BASF, which advocates Signum, a product which contains 67g/kg pyraclostrobin and 267g/kg boscalid as a water dispersible granule.
The product is designed to control chocolate spot (botrytis fabae), botrytis cinerea and uromyces fabae (rust) in winter and spring field beans. It is recommended at a dose rate of 0.5 to 1kg/ha, with up to two applications permissible with a harvest interval of 21 days.
BASF product manager John Young pointed out that chocolate spot is developing rapidly in spring beans following the long spell of cool wet weather, with most crops potentially at risk. Rust could also be a threat when temperatures rise again, he warned.
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