Chondrostereum purpureum

Silver leaf

Description

Chondrostereum purpureum is a pathogenic fungus affecting a wide range of deciduous trees and shrubs. It primarily infects trees through wounds, where it colonizes the vascular system, disrupting the flow of water and nutrients. The fungus produces characteristic purple fruiting bodies on dead or dying wood. It is most prevalent in Europe but occurs in temperate regions worldwide. The infection leads to leaf discoloration, wood decay, and a general decline in tree health, reducing both the vitality and aesthetic value of affected trees. Fruit trees, particularly those in the Rosaceae family, such as apple (Malus domestica), cherry (Prunus spp.), and plum (Prunus domestica), are highly susceptible. The fungus also affects poplars, willows, and various ornamental and forest trees. Severely infected trees may suffer branch dieback, structural weakening, and, in extreme cases, tree mortality.

Symptom

Leaves of infected trees develop a silvery sheen due to the destruction of epidermal cells. Affected branches exhibit progressive dieback, and fruiting bodies appear as violet to purple, leathery crusts on dead wood. Wood decay progresses from the infection site.

Tree Species: Elm, Birch, Oak, Chestnut, Pear, Apple Tree, Rowan, Whitebeam, Ash, Alder, Hazel, Lime, Walnut, Poplar

Part of a plant- attacked: Tree trunk, Leaf / Needle, Branch

Pest significance: Harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes