Rice short-spike virus

The causal agent of this condition is Tenuivirus oryzabrevis, a viral pathogen that belongs to the Tenuivirus genus. This disease affects the internal systemic structure of rice plants, impeding nutrient transport and proper development of reproductive structures.

The primary host for this pathogen is cultivated rice (Oryza sativa). While the virus can be found in various rice-growing regions, its prevalence is strictly dependent on the geographic distribution and population dynamics of its specific insect vectors.

Symptoms are easily identifiable during the heading stage. Plants exhibit severe stunting, a significant reduction in internode length, and the production of malformed, shortened panicles. This leads to poor grain filling and a high proportion of empty husks, causing substantial yield losses.

The transmission of Tenuivirus oryzabrevis is facilitated by insect vectors, primarily leafhoppers. The virus circulates within the vector, which transmits the pathogen to healthy plants through feeding. Warm, humid conditions that favor leafhopper breeding typically lead to higher infection rates.

Management strategies focus on reducing the primary inoculum source and protecting the crop from vectors. Farmers are advised to utilize resistant cultivars, implement rigorous weed control to eliminate alternative hosts, and apply targeted insecticide sprays to manage leafhopper populations during the early stages of rice development.