Pepper Mali begomovirus

The virus is characterized by a circular single-stranded DNA genome and is known for its ability to cause severe systemic infections in solanaceous crops.

Its primary host is the common bell pepper (Capsicum annuum), where it replicates within the phloem tissues.

Transmission occurs exclusively via the silverleaf whitefly (Bemisia tabaci), which acquires the virus through feeding and remains a lifelong vector.

Once introduced into the plant host, the virus spreads systemically, disrupting normal physiological and developmental processes.

Visible symptoms include severe leaf curling, distortion, and a characteristic mosaic pattern on the leaves ranging from pale to dark green.

Infected plants typically exhibit significant stunting and shortened internodes, leading to a compact, dwarfed appearance compared to healthy specimens.

The foliage often shows yellowing or chlorosis around the margins, significantly reducing the plant's photosynthetic capacity.

Fruit development is severely impaired, resulting in small, malformed, and spotted fruits that lack market value.

• Severe leaf curling and crinkling.
• Stunted plant growth and shortened stems.
• Yellow mosaic patterns on leaves.
• Small, misshapen fruit production.

Disease development is highly dependent on the population density of the whitefly vector, which thrives in warm and humid climates.

High temperatures accelerate the life cycle of the whitefly, leading to rapid increases in vector populations and higher transmission rates.

Weed hosts in and around agricultural fields act as primary reservoirs, allowing the virus to survive between crop cycles.

Poor greenhouse hygiene and lack of insect screens allow whiteflies to infiltrate young pepper seedlings, leading to early-stage infection.

Close proximity of infected older crops to new plantings facilitates the rapid migration of viruliferous whiteflies to healthy plants.

The virus causes severe economic damage, often resulting in near-total crop failure when infection occurs early in the growing season.

It severely reduces both the quantity and quality of pepper production, making the harvest unsuitable for fresh markets.

Because there is no cure for infected plants, the only management option for symptomatic plants is early detection and eradication.

The persistent nature of the virus in local weed populations makes it a recurring problem for farmers in endemic regions.

Increased susceptibility to other pests and secondary infections further compounds the damage caused by this viral pathogen.

Effective management focuses on managing the whitefly vector population through integrated pest management (IPM) practices, including the use of systemic insecticides.

Strict sanitation measures, such as removing and destroying symptomatic plants, are essential to minimize the source of inoculum.

Utilizing physical barriers like insect-proof netting in greenhouses prevents whiteflies from accessing and infecting the crop.

Regular monitoring of whitefly levels using yellow sticky traps helps in timely intervention before the virus spreads throughout the field.

Prioritizing the use of resistant or tolerant pepper varieties is the most sustainable and successful strategy for long-term disease control.