Solanum flavusvenae yellow vein disease

The causal agent of this disease is Begomovirus solanumflavusvenae, a plant virus belonging to the Geminiviridae family. These viruses are characterized by their small, geminate particles containing single-stranded DNA, which typically replicate in the host cell nuclei. The infection spreads systemically throughout the plant, causing significant metabolic disruption.

The primary hosts of this virus are economically important crops within the Solanaceae family, particularly tomatoes, peppers, and eggplants. Weed species surrounding agricultural fields often act as symptomless reservoirs, maintaining the viral population when primary crops are not available, which makes total eradication extremely difficult.

Symptoms typically begin with a distinctive yellowing or chlorosis of the leaf veins, which may lead to a mosaic-like pattern on the foliage. Infected plants exhibit severe stunting, leaf curling, and overall reduced vigor. Fruit production is drastically impacted, often resulting in small, malformed fruits that lack commercial value, leading to severe yield losses in infected regions.

The primary vector responsible for the transmission of Begomovirus solanumflavusvenae is the tobacco whitefly (Bemisia tabaci). Transmission is circulative and persistent, meaning the whitefly acquires the virus during feeding and remains infectious for the remainder of its life. High temperatures and humidity accelerate the whitefly life cycle, leading to rapid disease transmission within a field.

Management of this viral disease relies heavily on integrated pest management (IPM) practices, as there are no direct chemical treatments to cure infected plants. Recommended strategies include:

• Implementing strict whitefly population control through chemical, biological, and cultural methods.
• Using reflective mulches to deter insect vectors from landing on crops.
• Growing crops in insect-proof greenhouses or under screen covers to block vectors.
• Selecting resistant or tolerant cultivars developed by breeding programs.
• Practicing strict weed management to remove potential reservoirs of both the virus and its insect vectors.