Sugarcane mosaic

Sugarcane mosaic is caused by the Sugarcane mosaic virus (SCMV), a member of the Potyvirus genus. This systemic viral disease affects the plant's vascular system, disrupting photosynthesis and overall metabolic functions. The virus particles are flexible, filamentous structures that spread through both mechanical transmission and insect vectors.

The primary host crops include sugarcane and maize, although the host range extends to many grassy species such as sorghum and millet. The disease is distributed globally in tropical and subtropical regions where these crops are cultivated, resulting in significant economic losses in the agricultural sector due to reduced yields and quality.

Symptoms of the infection manifest as a characteristic mosaic pattern on the leaves, featuring alternating light and dark green areas that form patches or streaks. In severe cases, significant stunting of the plants, shortened internodes, and reduced sugar accumulation in the stalks are observed, which creates major issues for the sugar production industry.

In the field, the virus is primarily transmitted by insects, particularly various species of aphids that spread the infection in a non-persistent manner. Another critical factor is the use of infected planting material, such as cuttings or seedlings, emphasizing the necessity of managing the primary inoculum source to protect future plantations.

• Utilizing certified disease-free planting material.
• Breeding and planting virus-resistant sugarcane varieties and hybrids.
• Implementing spatial isolation between new fields and infected areas.
• Managing weed hosts that serve as virus reservoirs during the off-season.
• Applying insecticides to control populations of aphid vectors in the field.

Effective management of sugarcane mosaic relies on an integrated strategy involving quarantine measures and regular phytosanitary monitoring. Since there are no chemical agents available for curing viral infections, the focus remains on preventative agronomic practices that minimize the viral load within the agroecosystem.