Name: Gummy stem blight, Stagonosporopsis spp.
Symptoms on seedlings occur as light to dark brown spots on the cotyledons. Infection of the cotyledons or hypocotyl causes a water-soaked, brown discolouration of the tissues, followed by tissue desiccation and collapse. Seedlings die rapidly after infection of either the hypocotyl or cotyledons.
On older plants, leaf symptoms appear as small circular, tan spots up to 5 mm in diameter, sometimes surrounded by a yellow halo. Under favourable conditions, the leaf lesions may enlarge rapidly and become irregular in shape. When the lesions coalesce, the entire leaf may become blighted. The spots dry, become cracked and may tear, giving leaves a tattered appearance. Infection often begins at the leaf margins.