Initially small brown spots occur on leaves, sheaths and glumes. These expand to narrow elongate brown streaks with occasional dark brown line running across the lesion giving a netted appearance. Lesions may be surrounded by a yellow area. There is also a spot form of net blotch which looks like spot blotch. Spots can coalesce killing the leaf.
Conditions favouring good crop growth also favour development of leaf diseases. Losses are due to shrivelled seed and reduced seed yeild; infested grain may be rejected for malt.
