Rice stripe

Rice stripe is a significant viral disease caused by the Rice stripe virus (RSV), a member of the Tenuivirus genus. This disease primarily targets the vascular system of the host plant, severely disrupting nutrient transport and photosynthesis, which leads to stunted growth and reduced crop yields.

Although named after rice, the virus has a broad host range among graminaceous plants. Important agricultural crops such as winter barley, winter wheat, and maize are susceptible to infection. These crops often act as hosts that facilitate the survival of the virus throughout different growing seasons.

Symptoms of the disease typically appear as narrow chlorotic or necrotic stripes along the leaf blades. As the infection progresses, affected leaves may twist, turn yellow, and eventually become necrotic. Infected plants often display severe morphological changes, including reduced tillering and the development of empty, sterile panicles.

The transmission and spread of the virus are entirely dependent on its insect vector, the small brown planthopper (Laodelphax striatellus). The virus is transmitted in a persistent, propagative manner, meaning the vector remains infectious for its entire life and can pass the virus to its offspring, maintaining the disease pressure in the field.

Effective management requires an integrated pest management (IPM) approach to minimize the impact of RSV. Key strategies include the deployment of resistant cultivars, timely application of insecticides to suppress leafhopper populations, and rigorous weed control in and around the fields to eliminate alternative virus reservoirs. Early monitoring of vector populations is crucial for timely intervention.