Wheat streak mosaic

Wheat streak mosaic is a viral disease caused by the Wheat streak mosaic virus (WSMV). It is considered one of the most significant viral threats to cereal crops globally, primarily due to its efficient transmission mechanism and the ability to significantly reduce plant productivity.

The disease primarily impacts crops such as winter wheat and winter barley. The virus is highly persistent and can survive in volunteer wheat and various wild grass species, which serve as reservoirs of infection throughout the off-season, ready to infect new crops during autumn emergence.

The typical symptoms of the disease include yellow or light-green streaking and striping on the leaves, usually parallel to the veins. As the infection progresses, affected plants often show severe stunting, excessive tillering, and distorted or sterile heads, leading to significant yield losses in affected fields.

The spread of WSMV is entirely dependent on the wheat curl mite (Aceria tosichella). These mites carry the virus from infested volunteer wheat and move to newly emerged winter crops during warm and dry autumn conditions, which are ideal for mite migration and successful viral inoculation.

The economic impact of the virus is significant, as it can cause complete crop failure in severe infestation cases. Effective management strategies focus on cultural practices:

• eliminating volunteer wheat before the new crop emerges;
• maintaining spatial isolation from infected fields;
• selecting resistant or tolerant crop varieties;
• managing mite populations through precise timing of planting and chemical control where applicable.