Eggplant mosaic virus

It is an RNA virus that primarily affects solanaceous crops, causing systemic infection throughout the plant’s vascular system.

The virus is primarily transmitted by insect vectors, most notably the whitefly (Bemisia tabaci), which introduces the pathogen while feeding.

Mechanical transmission also plays a role, as the virus can spread through contaminated tools, equipment, and handling during routine agricultural activities.

The virus replicates rapidly within the host tissues, severely disrupting the plant's metabolic processes and overall growth efficiency.

The most distinctive symptom is a mosaic pattern on the leaves, characterized by a patchy distribution of light and dark green areas.

Foliar deformation is common, often appearing as curling, wrinkling, or filiform (thread-like) leaf shapes, which drastically reduces photosynthetic capacity.

Stunting is a hallmark of the infection, with infected plants remaining significantly smaller and weaker than healthy neighbors.

Fruits produced by infected plants show internal and external abnormalities, such as chlorotic mottling, necrotic spots, and ringspots.

• Leaf yellowing (chlorosis).
• Flower and fruit abscission.
• Reduced branching and stunted stems.

Disease progression is heavily favored by warm and humid environments, which are optimal for the proliferation of whitefly populations.

Greenhouses with poor ventilation and high humidity often serve as hotspots for viral outbreaks due to the ease of vector migration.

Weed species related to the nightshade family acts as primary reservoirs, harboring the virus during the off-season and facilitating early infection.

High temperatures (above 25°C) increase the speed of viral multiplication within the plant tissues, leading to faster appearance of symptoms.

High density of plants promotes quicker spread of vectors, leading to localized epidemics within a short timeframe.

Eggplant mosaic virus leads to substantial yield losses, sometimes reaching over 60-70 percent in susceptible varieties under high pressure.

The fruits produced are typically unmarketable due to severe distortions, size reduction, and surface lesions that detract from quality.

Infected plants become nutritionally depleted, making them more susceptible to secondary infections by bacteria and fungi, further compounding the damage.

The economic impact is heightened because there is no cure for an infected plant, requiring the complete removal and destruction of the infected biomass.

Long-term infestation in a field or greenhouse can render the site unsuitable for profitable solanaceous production for the entire season.

Prevention starts with using certified, virus-free seeds and seedlings, ensuring that new plants do not enter the farm already infected.

Strict vector management is essential; this involves using fine-mesh netting in greenhouses and targeted insecticide applications to suppress whiteflies.

Sanitation practices, such as disinfecting pruning tools and hands after contact with each plant, are critical to prevent mechanical spread.

Maintaining a weed-free buffer zone around the crop area eliminates alternative hosts for both the virus and its insect vectors.

Rogueing, or the immediate removal and destruction of symptomatic plants, helps to reduce the inoculum level and limits the spread within the field.