Tan, irregularly shaped or elongated blotches usually with yellow margins on both sides of leaves in late winter to spring. The leaf tips often wither where the lesions join. Heavy infection may cause total withering of leaves. In southern areas it is most often seen on young crops while in northern areas and WA it is often seen at all stages of the crop.
Associated stubble usually has small black fruiting bodies with short, hair like projections.
Wheat including Durum Wheat, Triticale and some grasses.
Barley and Cereal Rye are partially susceptible.
Lupins, Oats, Peas and broad-leaved species are resistant.
Survives over summer on stubble.
Leaves must remain wet or six hours for infection to occur. Infection occurs over a wide range of temperatures.
2 types of spores produced. Those from the over summering fruiting bodies spread short distances and those from infected green leaves are wind dispersed.
Barley, Cereal Rye and Oats may be infected if rain occurs near harvest and then these stubbles may infect a following Wheat crop.
Over summering fruiting bodies produce spores after rain that spread short distances to infect Wheat seedlings under wet conditions. Infected leaves produce wind-dispersed spores that rapidly spread the disease within the crop and to other crops.