Eyespot

Eyespot, also known as strawbreaker foot rot, is a fungal disease affecting cereal crops globally. It is caused by the pathogens Oculimacula yallundae and Oculimacula acuformis, which specialize in infecting the base of the stems, leading to severe structural compromise.

The primary hosts of this pathogen include winter wheat, barley, rye, and occasionally oats. The disease is particularly problematic in temperate regions with mild, wet winters, as these conditions allow the fungus to thrive and survive within crop residues for extended periods.

The characteristic symptoms appear at the base of the stem near the soil surface. These spots are oval-shaped and often resemble an eye, featuring a pale center with a dark brown margin. As the fungal infection advances, the stems become soft and brittle, which frequently results in lodging and lower grain weight.

Environmental conditions play a crucial role in disease dissemination. High humidity, frequent rainfall, and moderate temperatures (between 5°C and 15°C) facilitate the spread of spores via rain splash from infected stubble to new tillers. Dense canopy structures often exacerbate these conditions by trapping moisture.

Integrated management is essential for effective control. Key strategies involve the selection of resistant wheat varieties and strict crop rotation practices. Chemical control through the application of systemic fungicides at the early stages of stem elongation is highly recommended to protect the crop during the most vulnerable developmental phases.