Bean common mosaic

Bean common mosaic is a significant viral disease caused by the Bean common mosaic virus (BCMV). It is recognized globally as a major threat to bean production, capable of causing severe economic losses in various legume species, particularly common beans.

The pathogen primarily affects Phaseolus vulgaris. The virus is seed-borne, meaning that the use of infected seeds is a primary factor in the introduction of the disease into new fields or seasons, complicating management efforts for farmers.

Typical symptoms involve a mosaic pattern of light and dark green areas on the foliage. Infected leaves often exhibit downward curling, blistering, and distortion. In addition to leaf symptoms, plants may show stunted growth and poor pod development, leading to significantly lower yields.

The virus is transmitted by several species of aphids in a non-persistent manner, meaning they can acquire and transmit the virus in a very short time frame while probing the plant tissue. Environmental conditions that favor the rapid buildup of aphid populations also increase the rate of viral spread within the field.

Management and prevention focus on an integrated approach, which includes the following strategies:

• Planting resistant or tolerant cultivars;
• Using certified virus-free seed stocks;
• Implementing strict aphid control programs;
• Removing alternative host weeds around field edges.