Phoma risks – what’s new for autumn 2016?
Phoma remains the most widespread autumn disease in oilseed rape.
Research shows Cabbage Stem Flea Beetle damage makes OSR plants more susceptible to Phoma infection and disease yield loss.
Milder autumn conditions speed up disease movement and extend Phoma infection periods.
New trials highlight the need to focus early applications on Phoma, with enhanced Light Leaf Spot control from later targeted treatments.
PLOVER cost effectively stops Phoma infection, and gives early protection against Light Leaf Spot.
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.