Cocksfoot mottle

Cocksfoot mottle is a viral disease caused by the Cocksfoot mottle virus (CfMV), which belongs to the Sobemovirus genus. This disease primarily affects perennial grasses like cocksfoot (Dactylis glomerata), but it also poses a risk to other cereals, including winter wheat, acting as a significant phytosanitary concern in temperate climates.

Symptoms of the infection typically appear as mottling, chlorotic streaks, or spots on the leaf blades. As the virus progresses, the foliage may exhibit severe yellowing and dwarfing of the plant. In many cases, infected plants show reduced tillering and failure to produce healthy spikes, leading to a significant decrease in biomass and seed yield.

The transmission of the virus occurs primarily through mechanical contact and by insect vectors, specifically cereal leaf beetles. The virus particles are highly stable and can be easily transferred during mowing, grazing, or through the movement of farm machinery, making human activity a major factor in the rapid spread of the disease across fields.

The economic impact of Cocksfoot mottle is substantial, particularly in grassland agriculture and mixed cropping systems. Infected crops show poor vigor, and the nutritional value of forage grasses declines significantly. For winter wheat, the virus interferes with grain development, resulting in lower yields and poor grain quality.

Management and prevention strategies are essential for controlling the outbreak:

• Implementation of crop rotation schemes to break the infection cycle.
• Monitoring and managing populations of insect vectors with targeted insecticide treatments.
• Maintaining field hygiene by disinfecting equipment and tools used in field operations.
• Avoiding the grazing of infected areas to prevent further mechanical transmission of the virus.