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mildew
Mildew is a form of fungus. It is distinguished from its closely related counterpart, mold, largely by its color: molds appear in shades of black, blue, red, and green, whereas mildew is white. It appears as a thin, superficial growth consisting of minute hyphae (fungal filaments) produced especially on living plants or organic matter such as wood, paper or leather.〔(mildew ): Compact Oxford English Dictionary〕〔(mildew ): Merriam-Webster's Online Dictionary, 11th Edition〕 Both mold and mildew produce distinct offensive odors, and both have been identified as the cause of certain human ailments.
Horticulturalists classify mildew differently than most other people. In horticulture, mildew is either species of fungus in the order Erysiphales, or fungus-like organisms in the family ''Peronosporaceae''. It is also used more generally to mean mold growth. In Old English, mildew meant honeydew (a substance secreted by aphids on leaves, formerly thought to distill from the air like dew), and later came to mean mold or fungus.〔The American Heritage Dictionary of the English Language, 1969, entry "melit-" in Appendix〕
==Plant pathogens==
What horticulturalists and gardeners often refer to as mildew is more precisely powdery mildew. It is caused by many different species of fungi in the order ''Erysiphales''. Most species are specific to a narrow range of hosts, and all are obligate parasites of flowering plants. The species that affects roses is ''Sphaerotheca pannosa var. rosae''.
Another plant-associated type of mildew is downy mildew, caused by fungus-like organisms in the family ''Peronosporaceae'' (''Oomycota''). They are obligate plant pathogens, and the many species are each parasitic on a narrow range of hosts. In agriculture, downy mildews are a particular problem for potato, grape, tobacco and cucurbits farmers.
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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