Pepper leaf curl virus

Begomovirus capsicumyunnanense is a plant pathogen belonging to the Begomovirus genus within the Geminiviridae family. It is a serious viral disease that specifically impacts solanaceous crops. The virus is characterized by a bipartite or monopartite genome consisting of single-stranded DNA and relies on whiteflies for transmission.

The primary hosts of this virus are members of the Capsicum genus, including bell peppers and hot chili peppers. The virus is widely distributed in regions where whitefly populations are abundant. It can survive in various weed species that act as reservoirs, ensuring the persistence of the pathogen in the environment throughout the growing season.

Typical symptoms include severe leaf curling, stunting of the plant, and significant yellowing or mosaic patterns on the leaves. The infection leads to shortened internodes, which gives the plant a bushy appearance. Fruit production is severely impacted, resulting in small, malformed fruits that are not suitable for the market.

The transmission process occurs when a whitefly feeds on an infected plant and acquires the virus. After a short latent period, the insect becomes a persistent vector, capable of transmitting the virus to healthy plants. Hot and dry environmental conditions typically increase the whitefly reproduction rate, thereby accelerating the spread of the virus.

Management strategies are focused on minimizing the interaction between the vectors and the host plants. This includes utilizing fine mesh screens in greenhouses, employing systematic insecticide programs to manage whitefly populations, and strictly removing and destroying any plants exhibiting early symptoms of the virus to prevent secondary spread.