African cereal streak

African cereal streak is a viral disease caused by the African cereal streak virus (ACSV). This pathogen poses a significant threat to cereal production, particularly in regions where environmental conditions favor the proliferation of its insect vectors.

The virus has a relatively broad host range within the Poaceae family. Key crops affected by this pathogen include wheat, maize, sorghum, and winter barley. Wild grasses also play a critical role as non-crop reservoirs that harbor the virus during the off-season.

The characteristic symptoms include the formation of chlorotic streaks or broken stripes on the leaf blades, running parallel to the veins. As the disease advances, affected plants exhibit stunted growth, excessive tillering, and poor grain filling, which severely compromises the yield potential of the crop.

The transmission of ACSV is primarily mediated by specific leafhopper species. The development and spread of the disease are heavily dependent on the abundance of these vectors, which thrive in warm and humid conditions. High populations of leafhoppers at the seedling stage lead to widespread infection across the field.

Effective management strategies focus on integrated pest management (IPM). Key practices include the planting of resistant or tolerant cultivars, the application of insecticides to control leafhopper populations, and the removal of weed hosts from field margins to reduce the primary source of the inoculum.