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Causal organism - Pyrenophora tritici-repentis
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The disease is greatly favoured my minimum tillage systems as the disease survives mainly on crop debris left on the soil surface. Disposal of crop debris by ploughing can help prevent early infection. Many varieties are susceptible.
Seed infection is controlled by most seed treatments. It is essential to protect the upper leaves from disease by appropriate fungicide sprays when wet weather occurs between GS32 and GS39. Sprays applied against Septoria will normally control tan spot although timings are more critical as tan spot has a very short latent period (5-7 days).
