Oilseed rape growers are being urged to inspect their crops for phoma as the period of infection nears for a disease which can cut yields by up to 0.5t/ha, costing more than £150. Although disease levels are currently low, weather conditions are good for the release of disease spores, so symptoms may be more widespread by mid-October. Late-drilled crops and those damaged by cabbage stem flea beetles are likely to be most at risk. Crops with more than 10% of plants […]
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