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This forecast provides information on the date when we expect 10% of oilseed rape plants to show symptoms of phoma leaf spot, generally regarded as the threshold when considering the need for a fungicide application targeted against phoma.The forecast uses temperature and rainfall data to simulate the development of the Phoma fungus on crop debris and subsequent infection of young plants. For more information on the biology and the life cycle of the phoma stem canker pathogen, please see the Epidemiology page.

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Publications relating to Phoma stem canker

Phoma forecast

Prediction of 10% plants affected with phoma leaf spot

Phoma stem canker - Epidemiology

Phoma stem canker (blackleg), caused by Leptosphaeria maculans, is an important disease on oilseed rape (canola, rapeseed,Brassica napusBrassica junceaBrassica rapa) causing seedling death, lodging or early senescence in Australia, Canada and Europe.