Nectria pseudotrichia

Nectria pseudotrichia is a fungal pathogen responsible for various bark diseases in woody plants and shrubs. Often associated with the coral spot complex, this fungus acts primarily as an opportunistic parasite, colonizing stressed or wounded tissues of its host plants.

The disease affects a wide range of fruit trees, including apples, pears, and stone fruits, as well as various ornamental trees and shrubs. It is frequently observed on branches that have been weakened by environmental stressors, mechanical damage, or previous pest infestations.

Symptoms of the infection typically appear on the bark of twigs and branches, indicating the presence of the fungus within the wood.

• The formation of bright red or coral-colored fruiting bodies (perithecia) on the bark surface.
• Sunken necrotic lesions on branches that eventually lead to dieback.
• Wilting and death of distal parts of the infected branches.

Environmental conditions such as high humidity and moderate temperatures favor the development and spread of Nectria pseudotrichia. The spores are primarily dispersed by splashing water, rain, and wind, settling on wounds or cracks where they initiate the infection process.

The economic impact of this fungus is significant, as it can cause branch death and overall loss of vigor in orchards. To control the disease, arborists recommend sanitary pruning to remove infected material, maintaining tree health through proper fertilization, and using protective fungicides to cover pruning wounds.