Sorghum stunt mosaic

Sorghum stunt mosaic is a destructive plant disease caused by the Sorghum stunt mosaic virus (SSMV). This viral pathogen is primarily disseminated through specific insect vectors, which complicates traditional disease management strategies in large-scale sorghum production.

The primary host plant for this disease is sorghum (Sorghum spp.). Furthermore, various wild grasses and weed species act as natural reservoirs for the virus, allowing it to persist throughout the year and move into newly planted sorghum fields during the growing season.

The characteristic symptoms of the infection include severe stunting of the plants, which gives infected fields a patchy, uneven appearance. Foliage typically exhibits a distinct mosaic pattern, characterized by yellow or light-green chlorotic stripes that significantly impair the plant's photosynthetic capacity.

Transmission is facilitated by leafhoppers, such as Graminella nigrifrons, which acquire the virus while feeding on infected plants and transmit it to healthy ones. The prevalence of the disease is heavily dependent on the population dynamics of these insect vectors and environmental conditions that favor their migration.

The economic impact of Sorghum stunt mosaic is substantial, as it leads to drastic reductions in both grain yield and forage biomass. Heavily infected plants often fail to develop healthy panicles, leading to partial or complete sterility, which poses a major challenge to sorghum producers.

• Integrated pest management to control leafhopper populations.
• Eradication of wild grass hosts and weeds in and around fields.
• Deployment of resistant or tolerant sorghum cultivars.
• Optimization of planting dates to minimize exposure to insect vectors.
• Field monitoring to identify early signs of viral symptoms.