Colletotrichum needle necrosis of Norfolk Island pine (Araucaria heterophylia); caused by the anthracnose fungi Colletotrichum derridis. In most cases, long periods (up to 14 days) of high humidity are required for this infection to occur.
Photograph courtesy A. R. Chasefrom the Compendium of Ornamental Foliage Plant Diseases.
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