Written by Charlotte Cunningham
Some winter oilseed rape may already have 10% of the crop showing phoma symptoms and need treating, according to AHDB’s forecast for the disease. Charlotte Cunningham reports. Compiled by Rothamsted Research, the 2020 forecast reveals a wide range of predicted dates (13 Sept to 10 Nov) for crops to reach this threshold across the UK. But compared with 2019, most sites (19/29) are likely to reach the threshold earlier. In fact, the 2020 forecast predicted eight sites would reach it in Sept, in contrast to just two sites in 2019. Catherine Harries, who manages disease research at AHDB, said: “Phoma spores mature on stubble – a process that is favoured by warm, wet weather. Many sites monitored experienced such conditions in 2020, so it’s important to look for symptoms in the field, especially when the local forecast suggests the threshold date is near. Backing up the forecast findings, we’ve received reports of early-sown crops showing phoma symptoms.” About the phoma forecast Temperature and rainfall information (1 Jul to 26 Sept) is used to simulate the development of Leptosphaeria maculans – a key pathogen responsible for phoma leaf spot and phoma stem canker. Accounting for subsequent crop infection, the forecast predicts…
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