Fellhanera

Fellhanera is a genus of lichenized fungi that often colonizes the bark of trees and shrubs. While often perceived as a sign of disease, it is an epiphyte, meaning it uses the plant only as a substrate for attachment rather than deriving nutrients directly from the host plant's internal tissues.

This organism primarily affects woody plants, showing a preference for trees with rough, aging bark, or those growing in environments with high humidity. It is frequently observed in neglected orchards or forests where natural succession allows various lichen species to settle on the trunks and major branches.

Symptoms of Fellhanera colonization include small, crustose patches on the bark that can vary in color and texture. Although it is not a direct pathogen, excessive coverage can trap moisture against the tree's surface, potentially creating an environment conducive to secondary pathogens or insect pests.

The development of this lichen is favored by conditions such as high ambient humidity, heavy shade, and limited airflow within the canopy. Stagnant air around the tree trunk allows the lichen to establish itself more firmly and expand its coverage over time, especially in undisturbed habitats.

Control strategies for Fellhanera focus on managing the environment of the plant. This includes routine pruning to improve air circulation and sunlight penetration, mechanical removal of loose dead bark, and the application of copper-based fungicides during the dormant season to inhibit the growth of lichens and mosses on the bark surface.