Currently unidentified pathogenic organisms are causing a disease in 8-year-old commercial plantations of Tectona grandis in Costa Rica. The affected trees are found in groups and isolated, the symptoms found in the field are the bulging of the bark at the base of the trunk and rotting of the base and root of the trees. In some trees, the sign of the pathogenic organisms is a black or dark gray stromatic structure at the base.

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