Peanut stripe virus

It is an obligate parasite that relies entirely on living host tissue for its viral replication and systemic infection cycle.

The virions are characterized by filamentous, flexible structures that contain a single-stranded RNA genome of positive polarity.

The virus exhibits significant genetic variability, which helps it persist and adapt to diverse ecological conditions within peanut-growing regions.

Field diagnosis often requires laboratory confirmation through serological techniques like ELISA or molecular approaches such as RT-PCR.

The primary economic host of this virus is the cultivated peanut, where it causes substantial reduction in yield and seed quality.

Beyond peanuts, the virus has a broad host range among the Leguminosae family, including soybean and various forage crops.

Infection induces systemic stress throughout the plant, severely disrupting photosynthetic capacity and overall nutrient metabolism.

The pathogen is seed-borne, allowing for its long-distance distribution through contaminated planting material trade.

Chronic infection results in deformed pods and stunted plants, leading to severe economic losses for agricultural producers.

The disease cycle begins with primary infection, typically initiated by planting virus-infected seeds in the soil.

Once established, the virus is spread within the field by aphids in a non-persistent manner during their short feeding probes.

The disease spread usually accelerates during the active growing season, coinciding with the population peaks of aphid vectors.

Weed hosts serve as essential overwintering reservoirs, allowing the virus to persist between cropping seasons in temperate and tropical areas.

Environmental conditions that favor aphid movement, such as mild temperatures and high humidity, significantly boost the transmission rate.

The most distinctive symptom is the appearance of dark green stripes or bands running parallel to the lateral veins of the leaves.

Affected plants often display a mosaic-like pattern on the foliage, accompanied by general chlorosis and leaf distortion.

Severely infected peanut plants exhibit stunted growth, reduced leaf size, and significant shortening of internodes.

The reproductive impact includes poor pod formation, reduced pod number, and malformed seeds with reduced germination potential.

• Dark green striping along leaf veins
• Mosaic patterns on leaf surfaces
• Stunted plant development
• Distorted leaves and shortened internodes

The most critical management strategy is the use of high-quality, virus-free seeds certified through rigorous inspection processes.

Integrated pest management should focus on controlling aphid vectors during the vulnerable early growth stages of the peanut crop.

Sanitation practices, including the eradication of weeds that harbor the virus near crop fields, are vital for reducing primary inoculum.

Crop isolation and spatial separation from previously infected areas can help mitigate the risk of secondary transmission.

Ongoing research emphasizes the development of genetic resistance, which provides the most sustainable defense against the spread of PStV.