Abstract
This paper presents the results of a study on the diseases of Porphyra yezoensisUeda along the north coast of China, where red rot (Pythium porphyrae) and the chytrid Olpidiopsis sp. diseases were both found to be present. Infection by the mycelia of Pythium porphyraeand the thallus of Olpidiopsis sp. was studied in detail. At the early stage of infecton the mycelia of Pythium porphyraeand the fungus of chytrid can be found in host cells at the same time. In the middle and late stages of the complication, it mainly appears as red rot disease, toward the end appearing almost completely as red rot disease. The complication even can be found on the cells of fronds from the freeze-storage nori nets. However, the freeze-storage nets can help prevent spread of the infection and improve nori quality.
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