Eragrostis minor streak virus

The Eragrostis minor streak virus (Mastrevirus eragrostisminoris) is a viral plant pathogen belonging to the Mastrevirus genus. This virus primarily affects grasses within the Eragrostis genus, posing a threat to both wild ecosystems and adjacent agricultural cereal crops. It utilizes a circular single-stranded DNA genome and relies on specific insect vectors for transmission between hosts.

The host range of Mastrevirus eragrostisminoris is focused on annual grasses, particularly Eragrostis minor. While its impact is most notable in wild grasses, the virus can spill over into cultivated crops if the environmental conditions favor the movement of vector insects from infested weeds to commercial fields. Understanding the ecological links between wild hosts and crops is crucial for effective management.

Symptoms of the infection typically present as distinct chlorotic streaks running parallel to the leaf veins. As the viral infection progresses throughout the plant tissues, affected plants often exhibit severe stunting, reduced tiller production, and shortened internodes. In many cases, the plant fails to reach its reproductive stage, leading to significant reductions in seed yield and biomass.

The transmission of this virus is strictly dependent on insect vectors, mainly leafhoppers. These insects acquire the virus by feeding on infected plants and subsequently transmit it to healthy hosts during their feeding cycles. The spread of the disease is highly correlated with the seasonal abundance of these vectors, which is often stimulated by warm and humid conditions.

• Remove weed hosts surrounding the field to eliminate the viral reservoir.
• Implement integrated pest management (IPM) to suppress leafhopper populations.
• Practice crop rotation to minimize the build-up of viral inoculum.
• Ensure spatial isolation from areas with high populations of susceptible grasses.
• Perform regular scouting to detect and rogue out initially infected plants.