Phaeoacremonium italicum

Phaeoacremonium italicum is a pathogenic fungus belonging to the group of fungi responsible for grapevine trunk diseases (GTDs). It acts as a primary agent in the decline of wood structure, contributing significantly to conditions often collectively referred to as esca complex or Petri disease.

The fungus predominantly affects grapevines (Vitis vinifera). The infection typically occurs through wounds caused by pruning, mechanical harvesting, or weather damage, which serve as entry points for the fungal spores into the vascular xylem tissue of the plant.

Symptoms of the infection include the internal browning or black streaking of the woody tissues, which can lead to vine dieback. Affected vines often show stunted growth, chlorotic leaves, and poor fruit development. In many cases, the disease progresses slowly, making early detection difficult until severe damage has already occurred.

Environmental conditions that favor the spread of the pathogen include high humidity and moderate temperatures, which are conducive to spore dispersal and colonization. The disease can easily spread within a vineyard through contaminated pruning tools or wind-borne spores landing on fresh wounds.

The economic impact of Phaeoacremonium italicum is significant due to the gradual loss of productivity and the ultimate death of infected vines. Management strategies focus on strict sanitation, such as applying protective sealants to pruning wounds, disinfecting tools with appropriate chemicals, and ensuring that planting material is sourced from certified, pathogen-free nurseries.