Ascoporia canker

Ascoporia canker is a specific fungal disease caused by the pathogen Ascoporia lateritia. This fungus primarily affects woody plants, particularly those in the Rosaceae family. It is recognized as a serious threat to tree health, as it targets the cambium and bark tissues, hindering the transport of water and nutrients throughout the plant vascular system.

The characteristic symptom of the disease is the development of brick-red lesions on the bark surface. As the infection progresses, the underlying wood tissue begins to soften and decay. Over time, these areas may develop deep fissures or open sores, often accompanied by exudates that indicate the active metabolism of the fungal mycelium colonizing the host tissues.

The infection cycle is heavily dependent on environmental conditions, particularly high humidity and moderate temperatures. The fungal spores are typically disseminated by wind or rain splash, landing on wounds or natural cracks in the bark. Once the spores germinate, the mycelium penetrates deep into the tissues, establishing a persistent and damaging colony within the woody structure.

The economic impact of Ascoporia lateritia is severe, as it causes systemic decline in trees, reduced fruit production, and dieback of limbs. If left unmanaged, the necrosis can spread rapidly, leading to the total loss of the tree structure. Its ability to survive in dead or dying plant material makes it a challenging pathogen to eradicate once it becomes established in an orchard.

Successful management relies on an integrated pest management approach that prioritizes sanitation and protection. Key control measures include:

• Prompt removal and destruction of all infected limbs to reduce inoculum pressure.
• Application of antifungal wound paints to all pruning sites immediately after trimming.
• Preventative spraying of copper-based fungicides during the dormant season.
• Maintenance of tree vigor through appropriate fertilization and water management.
• Careful monitoring of bark integrity to detect early signs of localized necrosis.