Bean curly top virus

The causative agent of the disease is the Begomovirus mestae, a virus belonging to the Geminiviridae family. This pathogen specializes in attacking the vascular system of the host, disrupting nutrient translocation and causing systemic physiological distress throughout the entire plant structure.

The primary host for this viral infection is common bean (Phaseolus vulgaris). The virus relies heavily on specific insect vectors to bridge the gap between infected and healthy plants, making the ecology of the vector a crucial component of the disease's overall epidemiology.

Common symptoms of infection include severe curling and deformation of the upper leaves, which often show chlorotic patterns. Affected plants display stunted growth, significantly shortened internodes, and a reduced number of pods, which leads to substantial agricultural losses in yield and quality.

Development and spread of the disease are primarily driven by populations of the tobacco whitefly (Bemisia tabaci). Warm and arid environmental conditions favor the reproduction and rapid dispersal of the vector, which facilitates the horizontal transmission of the virus across fields.

• Monitor whitefly population density regularly.
• Use systemic insecticides early in the season.
• Implement wide spatial isolation from susceptible crops.
• Remove volunteer plants and weeds that harbor the virus.

Management strategies focus on breaking the transmission cycle by controlling the whitefly population. Integrated Pest Management (IPM) practices, such as the use of resistant varieties, reflective mulches, and strategic planting dates, are essential to maintain field health and ensure economic viability.