Crepidotus mollis

Crepidotus mollis is a basidiomycetous fungus typically categorized as a saprotroph that induces white rot in wood. In an agricultural context, while it is not an obligate pathogen, it acts as a secondary colonizer of stressed or injured trees, significantly contributing to the structural degradation of woody plants by decomposing lignocellulose compounds.

This fungus primarily targets deciduous trees, including species like poplar, willow, and birch, as well as various fruit-bearing trees. It thrives in locations where the bark has been breached due to mechanical damage, frost cracks, or improper pruning, which serves as a gateway for fungal spores to settle and begin the decay process.

Symptoms of infestation are marked by the presence of its gelatinous or leathery fruiting bodies, which appear as fan-shaped or bracket-like structures on the bark. These are typically creamy white or pale brown. Internally, the wood under these structures shows signs of softening, discoloration, and a significant loss of structural integrity, becoming brittle over time.

The development of Crepidotus mollis is heavily dependent on high moisture levels and adequate substrate availability. The fungus spreads via wind-dispersed spores that germinate rapidly in humid conditions. Wet seasons and orchards with stagnant water or poor air circulation are particularly prone to fungal colonization by this organism.

The damage caused by this fungus can lead to branch breakage and decreased tree longevity, negatively impacting overall orchard productivity. Protection strategies focus on improving tree vigor and eliminating potential colonization sites. Regular sanitation, proper pruning techniques, and the use of wound dressings are essential practices to mitigate the risks associated with this wood-decaying fungus.

• Sanitary pruning of dead or infected branches.
• Use of antiseptic sealants on large pruning cuts.
• Maintaining proper drainage and air circulation in orchards.
• Regular inspections of tree trunks for fungal fruiting bodies.