Didymella leaf scorch

Symptoms are found on lower leaves early in the season and upper leaves later on. Lesions are usually elliptical and although chlorotic at first, soon become buff to brown in colour, often splitting longitudinally. Initially lesions have a dark brown margin with papery white centre. The fungus often invades damaged leaf tissue such as that caused by liquid urea or nitrogen. Symptoms become less distinct with time and become very similar to those caused by S.nodorum.  Pycnidia within the lesions are generally black, distinguishing the disease from S.nodorum which tends to have light coloured pycnidia