Neofusicoccum australe

Neofusicoccum australe is a fungal pathogen belonging to the Botryosphaeriaceae family within the phylum Ascomycota. As a serious plant pathogen, it is recognized as a primary causative agent of botryosphaeria dieback. It typically manifests as a systemic infection that colonizes the vascular tissues of woody plants, leading to severe physiological disruptions.

The host range of this pathogen includes a variety of economically significant crops such as grapevines, stone fruits (peaches, plums), pome fruits, and nut-bearing trees. The symptoms caused by this fungus include cortical necrosis, branch dieback, fruit rot, and the formation of deep cankers. If left unchecked, the infection disrupts nutrient and water transport, eventually killing the host.

The biology of Neofusicoccum australe is characterized by the production of pycnidia, which serve as reservoirs for conidia. These spores are dispersed by splashing rain, irrigation water, and wind. Human activity, specifically pruning and harvesting with contaminated tools, is a major factor in the rapid transmission of the fungus throughout an orchard or vineyard block.

Optimal conditions for development include high humidity and temperatures ranging between 20°C and 28°C. Plants that have been weakened by environmental stressors—such as moisture deficits, excessive fruit loads, or severe pruning wounds—are significantly more susceptible to colonization. The fungus often remains asymptomatic for extended periods, making early detection extremely difficult.

The economic impact of Neofusicoccum australe is high due to permanent damage to plant structure and crop loss. To protect orchards and vineyards, implement these management strategies:

• Systematic removal and destruction of infected wood and prunings.
• Strict sterilization of pruning shears and saws using suitable disinfectants.
• Application of protective fungicides during sensitive phenological stages.
• Maintaining plant vigor through balanced nutrition and proper irrigation to reduce susceptibility.