Erostrotheca multiformis

Erostrotheca multiformis is a pathogenic fungus that causes necrosis of bark and vascular tissues in various woody plants. Classified as a harmful microorganism, it often leads to dieback symptoms in branches, negatively impacting the growth and overall vitality of infected trees, particularly in nurseries and plantations.

The host range of Erostrotheca multiformis primarily includes various deciduous trees and shrub species. The fungus is an opportunistic pathogen that thrives on compromised host tissues, making it a significant concern for arborists and foresters tasked with maintaining the health of sensitive woody vegetation.

Symptoms of this disease are often progressive and difficult to reverse once they become established. Common clinical signs include:

• Development of sunken necrotic lesions on the bark surface.
• Appearance of distinct, small, black perithecia on the affected bark areas.
• Browning and wilting of foliage on distal branches.
• Cankers that can eventually girdle branches, causing them to die off.

The development and dissemination of the pathogen are heavily dependent on environmental humidity and temperature levels. Moisture facilitates the production and spread of fungal spores, which are transmitted via wind or water splash. Frost damage and previous insect attacks often exacerbate the susceptibility of trees to infection, as these create portals for the pathogen to enter the cambium.

Effective management requires a combination of cultural and preventive measures. The most critical step is strict sanitation: the prompt removal and proper disposal of infected branches prevent the inoculum from spreading to healthy trees. Maintaining tree vigor through appropriate fertilization and preventing mechanical injuries are also essential strategies to mitigate the risk of infection by this fungus.