Bean golden mosaic virus

Bean golden mosaic virus (Begomovirus phaseolialbi) is a significant plant pathogen belonging to the Geminiviridae family. It is a viral disease characterized by its ability to cause severe stunting and discoloration, significantly impacting the productivity of legume species.

The primary host for this virus is the common bean (Phaseolus vulgaris). It poses a severe threat, particularly in warm climates where environmental conditions allow for the year-round survival of both the host plant and the virus's primary vector.

Symptoms of the infection typically appear as bright yellow or gold mosaic patterns on the leaves, which often give the plant a distinct mottled appearance. In addition to discoloration, the foliage may become severely puckered, curled, and smaller than healthy leaves, leading to reduced photosynthetic capacity.

The development and spread of the disease are dependent on the presence of the whitefly Bemisia tabaci. This insect acts as a vector, acquiring the virus from infected plants and transmitting it to healthy ones while feeding. Transmission does not occur through seeds, making vector control the cornerstone of disease management.

The economic impact is profound, as the virus can lead to complete yield loss in highly susceptible bean varieties. To prevent the spread, farmers should implement a robust pest management program focusing on controlling whitefly populations. This includes the use of resistant crop varieties, planting timing to avoid peak vector activity, and the implementation of field sanitation practices to eliminate alternative weed hosts.