Arachnopeziza candidofulva

The disease is caused by the ascomycete fungus Arachnopeziza candidofulva. Primarily recognized as a saprotrophic organism that breaks down organic matter, it can also act as a secondary pathogen, impacting weakened plants, bark, and dead wood tissues across various broad-leaved trees and shrub species.

Plants susceptible to this fungus include various deciduous tree species and ornamental shrubs. The pathogen typically establishes itself on decaying plant material, but in high-stress scenarios where the plant's immune system is compromised, it may transition to more active tissue colonization, which accelerates the decomposition process.

Diagnostic symptoms include the formation of small, distinct, cup-shaped fruiting bodies known as apothecia. These structures are usually characterized by a fine, white or pale yellowish pubescence. The area around these fungal structures often exhibits discoloration and softening of the plant tissue, indicating localized decay caused by the mycelial network.

The development and proliferation of the fungus are heavily influenced by environmental moisture levels and poor ventilation. High humidity and stable, moderate temperatures create ideal conditions for spore release and colonization. Crowded plantations, shaded areas, and debris-rich environments significantly exacerbate the risk of infection.

The economic and biological impact involves the degradation of plant structural integrity.

• Regular sanitary pruning of affected branches.
• Maintaining optimal air circulation and sun exposure in planting sites.
• Removal of dead organic debris to reduce inoculum sources.
• Application of protective fungicides during periods of high humidity.