There is no scientific explanation for the extreme increase of bark fissures. Bark fissures, on confined scale, is already known at some trees. The bark can crack as result of extreme drought, frost or growth. The new bark fissures are being found at many trees in the public space. Municipalities and plantations suffer from economic damage. The tree is damaged cosmetically and its economic value is reduced.
Because of necrosis of the outer layers of the bark normal bark expansion is prevented. Sometimes the tree responds by forming new layers of periderm. With further growth, bark fissures become deeper.
At this time, about 10 % of all broadleaf trees in the municipality’s urban environments displays bark striations or bark fissures, sometimes in combination with phloem nodes. Because no biological factor is found further investigation is necessary.