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出典:Wikipedia
出典:『Wikipedia』 (2010/06/07 01:37 UTC 版)
Canna rust is a fungal disease of canna caused by Puccinia thaliae. Symptoms include orange spots on the plant's leaves and stems. In advanced stages of infection, the upper leaf-surface spots coalesce, turn dark brown-to-black and finally the infected leaves become dry and fall.
Canna rust