Capulavirus phaseoli

Pathogen and disease type. Capulavirus phaseoli is a plant pathogenic virus belonging to the genus Capulavirus within the Geminiviridae family. As a DNA virus, it infects host cells, leading to severe systemic diseases that disrupt plant physiological processes, resulting in stunted growth and altered biological development.

Host crops. The primary host for this virus is the common bean (Phaseolus vulgaris). While primarily affecting beans, the virus can persist in various leguminous plants and certain weeds, which act as secondary hosts and reservoirs throughout the growing season.

Symptoms and signs of infection. Infected plants typically exhibit characteristic leaf mosaic, chlorosis (yellowing), and leaf curling. The growth of the plant is significantly inhibited, leading to a stunted appearance. Furthermore, flower production is often reduced, and pods that do develop are frequently malformed, significantly impacting crop yield and quality.

Conditions for development and spread. The virus is transmitted by insect vectors, primarily aphids (such as Aphis craccivora). The spread of the disease is strictly correlated with the population dynamics of these insects. When aphids feed on infected plants, they acquire the virus and subsequently transmit it to healthy plants during their feeding cycle, facilitating rapid spread across the field.

Harmfulness and protection measures. The economic impact of Capulavirus phaseoli is high due to the potential for significant harvest losses. Management relies on an integrated approach:

• Early identification and rogueing of symptomatic plants.
• Chemical control of aphid vectors using selective insecticides.
• Strict weed control to eliminate alternative hosts.
• Selection of resistant or tolerant cultivars suitable for specific climatic zones.