Smaller plants are at higher risk of Phoma developing into canker
Phoma moves faster in warmer conditions. Disease spread on the leaf gets progressively quicker between 3°C and 15°C. Early season small leaves are at higher risk and require greater Phoma protection.
Phoma stem canker identification
Last season’s infection will inevitably have an impact on yield this harvest. But it also poses a serious risk for the new crop this autumn.
Old crop cankers, mixed in with the stubble trash, will be the source of infective spores. Rain events over the autumn trigger continuous further spore release and infection events.