Citrus anthracnose

The causative agent of a severe form of citrus anthracnose is the fungus Colletotrichum abscissum. This pathogen is a significant threat to citrus production worldwide, particularly affecting the yield and quality of citrus fruits by inducing premature fruit drop and tissue necrosis.

Host plants primarily include various species of the genus Citrus, such as lemons, limes, and oranges. The fungus specifically attacks the reproductive structures, leading to a condition often characterized by the rapid abscission of flowers and young fruitlets.

Symptoms include the appearance of small, dark necrotic spots on petals and leaves. As the infection progresses, affected tissues turn necrotic, and orange-colored conidial masses may become visible on the surface of the lesions, indicating active sporulation of the fungus.

The development of the disease is heavily dependent on moisture. Prolonged rain, high humidity, and moderate temperatures during the flowering stage create the ideal environment for the spores to germinate and infect the host plant. Rain splash is the primary mechanism for local disease spread.

Control measures emphasize integrated disease management strategies. Key actions include maintaining tree health through proper pruning to improve air circulation, removing infected plant debris to reduce inoculum, and applying targeted fungicides during the vulnerable stages of blooming.

• Regular pruning for improved canopy aeration.
• Fungicide applications during bloom time.
• Sanitation by removing diseased fruit and twigs.
• Monitoring weather patterns to time chemical treatments.