Diplodia corticola

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Diplodia corticola - A) ascomata partially erumpent through the host bark; B) multilocular ascoma cut through horizontally revealing the brilliant white contents; C) vertical section through an ascoma showing the thick wall and three locules opening through periphysate ostioles; D, E) ascus tip as seen by interference contrast (D) and phase contrast (E) showing the well-developed apical chamber; F) mature ascus containing ascospores, several immature asci and pseudoparaphyses; G) pseudoparaphyses; H–J) ascospores; K, L) brown, 2-septate ascospores. Scale bars: A = 1 mm, B = 500 μm, C = 100 μm, D, E, G = 10 μm, F = 20 μm, H–L = 5 μm.
Author(s): A.J.L. Phillips, A. Alves, J. Abdollahzadeh, B. Slippers, M.J. Wingfield, J.Z. Groenewald and P.W. Crous
Source: Studies in Mycology, 2013, 76, p.87

Diplodia corticola A.J.L. Phillips, A. Alves & J. Luque 2004

The fungus is found in Europe and North America, causing canker, vascular necrosis and dieback of oak which can lead to tree death. In Mediterranean countries cork oaks (Quercus suber) are mainly infected because during cork harvest entry points for the fungus can be created.

The cankers on trunk and branches are sunken and often bleeding. Wilting of the foliage is also often a result of the disease. Dispersal of the fungus involves conidia which spread through wind, water and probably insect vectors. Pycnidia are also produced.

Synonym:
Botryosphaeria corticola