LOOK OUT FOR:

White surface patchesf

Small black spore cases

RISK FACTORS:

Cool, cloudy and moist conditions

Initially seen as surface patches of white mycelium, powdery mildew develops to cover the entire leaf. Mature infections often have black spore cases present.

The disease is wind borne and thrives in cool, wet weather.

While normally modest, yield losses of 40% have been recorded.