Pepper leaf curl virus

The causal agent of this disease is Begomovirus capsikanpurense, a virus classified within the Geminiviridae family. It is a highly significant pathogen that causes substantial economic losses in agricultural sectors. These viruses are characterized by their ability to manipulate the host plant's metabolism, leading to severe physiological dysfunction and stunted growth.

The primary host for this virus is the pepper plant (Capsicum spp.). However, the virus also affects various weeds in the Solanaceae family, which serve as crucial reservoirs for the pathogen. Understanding the host range is vital for integrated pest management, as these reservoirs allow the virus to persist in the environment even in the absence of primary crops.

Symptoms of the infection manifest primarily as upward or downward curling of the leaves, accompanied by vein yellowing and thickening. Infected leaves often become brittle and deformed. The severe physiological stress results in flower abortion, reduced fruit set, and the production of distorted, unmarketable fruits, causing significant yield degradation.

The transmission of Begomovirus capsikanpurense occurs through the tobacco whitefly (Bemisia tabaci). This insect acts as a vector, acquiring the virus during feeding and transmitting it to healthy plants. The spread of the disease is highly correlated with environmental factors such as high temperature and humidity, which favor the rapid proliferation and migration of the whitefly vector.

Management of this virus requires a multi-faceted approach centered on vector control. Effective strategies include:

• Implementing strict phytosanitary measures to eliminate weed hosts.
• Using insect-proof netting in greenhouse production systems.
• Applying systemic insecticides to minimize the population of whitefly vectors.
• Growing virus-resistant or tolerant pepper varieties where available.
• Managing crop residues immediately after harvest to prevent virus carryover.