Cystostereum murrayi

Cystostereum murrayi is a pathogenic wood-decay fungus responsible for causing white rot in a variety of tree species. As a lignicolous fungus, it specializes in the decomposition of wood tissues, specifically targeting lignin, which leads to the structural degradation of the host tree's heartwood.

This pathogen commonly affects a wide range of hardwood species and some conifers. The infection process typically begins when fungal spores enter the host through physical wounds, including storm damage, broken branches, frost cracks, or improper pruning cuts, allowing the mycelium to colonize the interior wood.

Visible symptoms often include the development of leathery, resupinate, or slightly effused-reflexed fruiting bodies on the bark of infected trees. Internally, the wood undergoes a transformation characterized by a bleaching effect and a fibrous, stringy texture, which indicates the progressive breakdown of the timber's cellular structure.

The development and spread of Cystostereum murrayi are highly dependent on environmental conditions, particularly high humidity and temperatures that support fungal growth. The disease is most prevalent in dense, poorly managed stands where deadwood, logging residue, and old stumps provide an ideal breeding ground for spores.

Management and prevention focus primarily on silvicultural practices aimed at reducing inoculum levels in the forest. Recommended actions include the timely removal of infected trees, systematic sanitation logging, and the application of wound sealants or protective dressings to fresh cuts to prevent the entry of airborne spores.