/PC300052.JPG)
Trunk canker on a shower tree (Cassia javanica), associated with a trunk infection by the plant-pathogenic fungus, Phomopsis sp. |
/PC300053.JPG) Incipient trunk cankers on a shower tree (Cassia javanica), associated with a trunk infection by the plant-pathogenic fungus, Phomopsis sp.
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/PC300054.JPG) Trunk canker on a shower tree (Cassia javanica), associated with a trunk infection by the plant-pathogenic fungus, Phomopsis sp. |
/PC300058.JPG) Stains from stem bleeding of a shower tree (Cassia javanica), associated with stem cankers and infection by the plant-pathogenic fungus, Phompsis sp. |
A canker is a plant disease characterized (in woody plants) by the death of cambium tissue and loss and/or malformation of bark, or (in non-woody plants) by the formation of sharply delineated, dry, necrotic, localized lesions on the stem; "canker" may also be used to refer to the lesion itself, particularly in woody plants.
Etymology. O.E. cancer, from L. cancer; influenced in M.E. by O.N.Fr. cancre. The word was the common one for "cancer" until c.1700.