Crown Rust of Grasses
· Oat · Barley
Formation of large, linear, light orange pustules mainly on the upper side of leaves. Occasionally, they also appear on leaf sheaths, peduncles, awns and panicles in case of heavy infection. These pustules are often grouped in clusters. With time, they become light brown and extensive chlorosis and leaf senescence also develop on the leaves. However, the infection rarely kill whole plants. The development of necrosis reduces the photosynthetic rates of the plant, which in turn reduces growth and yield. Grains are often shriveled and their quality reduced. Heavy infections also makes plants more sensitive to drought conditions, which can cause death in case of adverse weather.
The symptoms are caused by the fungus Puccinia coronata, which can survive in-between seasons on alternative hosts or crop residues left in the field. Under favorable conditions in spring, the fungus resumes growth and produces spores that become the primary source of inoculum. The pustules that form on leaves produce another type of spore that are spread by the wind (secondary source of inoculum). The fungus undergoes several cycles of reproduction on barley during the growing season. It affects cultivated and wild species of barley and oat, as well as a number of grasses and, notably, the perennial weed commonly known as buckthorn (Rhamnus cathartica). Mild to warm (20 to 25°C) sunny days and mild nights (15 to 20°C) with adequate moisture for dew formation are favorable for the fungus.
No biological treatments are known against this disease. If you know of any, please contact us, we will be happy to hear from it.
Always consider an integrated approach with preventive measures together with biological treatments if available. Several commercially available products can be used against this pathogen. Formulations based on propinoconazole are highly recommended.