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Pythium aphanidermatum
''Pythium aphanidermatum'' is a soil borne〔(Pythium_aphanidermatum )〕 plant pathogen. ''Pythium'' is a genus in the class Oomycetes, which are also known as water molds. Oomycetes are not true fungi, as their cell walls are made of cellulose instead of chitin, they are diploid in their vegetative state, and they contain coenocytic hyphae (lacking crosswalls), called a protist.〔(Oomycetes )〕 Also, they reproduce asexually with motile biflagelette zoospores that require water to move towards and infect a host. Sexually, they reproduce with structures called antheridia, oogonia, and oospores.
==Hosts==
''Pythium aphanidermatum'' has a wide host range, and can have economic impact on the cultivation of beets, peppers, chrysanthemum, cucurbits, cotton and turf-grasses,〔 however, because ''P. aphanidermatum'' requires warmer temperatures, it is often seen in greenhouses〔(Pythium root rot of Herbaceous Plants )〕 and has a large impact in poinsettia production.〔(Pythium factsheet )〕 It is a major cause of root rot in papaya production in subtropical areas. While this is almost exclusively a plant pathogen, there is one documented case of ''P. aphanidermatum'' infecting a human being injured in the Afghanistan conflict.〔(''Pythium aphanidermatum'' Infection following Combat Trauma )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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