Passion fruit leaf curl virus

Pathogen and disease type. Begomovirus passifloracontorsionis is a serious viral pathogen belonging to the Begomovirus genus within the Geminiviridae family. It induces a systemic disease characterized by severe developmental disorders and profound physiological stress within the host plant tissue.

Affected crops. The virus primarily infects plants of the Passiflora genus, particularly commercial cultivars of passion fruit. It is predominantly found in tropical and subtropical regions where the environmental conditions facilitate the year-round survival of the virus and its specific vectors.

Symptoms and signs. Clinical manifestations include striking leaf curling, crinkling, and mosaic patterns. Infected plants typically exhibit stunted growth, shortened internodes, and distorted leaf blades. In severe cases, the entire plant architecture becomes deformed, leading to poor canopy development and reduced photosynthesis.

Development and impact. The virus is transmitted exclusively by the whitefly Bemisia tabaci in a circulative, persistent manner. The spread of the disease is highly correlated with whitefly population density, which increases rapidly during warm and dry periods. Economic impact is significant, as infected plants suffer from reduced fruit set, lower quality, and total yield failure.

Control and prevention measures. Management strategies focus on vector control and strict sanitation practices:

• Utilization of virus-free certified nursery stock for plantation establishment.
• Implementation of protected cultivation using fine-mesh insect screens.
• Strategic application of systemic insecticides to manage whitefly populations effectively.
• Rouging and immediate destruction of symptomatic plants to eliminate the source of inoculum.