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Words: 446 Copyright: 2005 Marilyn Pokorney
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Damping off is single term used to describe underground, soil line, or crown rots of seedlings due to unknown causes. The term actually covers several soil borne diseases of plants and seed borne fungi. The fungi which cause root rot are species of Phyium, Phytophthora, Rhizoctonia and Fusarium.
There are two types of damping off: pre-emergence and post- emergence. In pre-emergence damping-off, seeds may rot and seedlings may decay before they emerge. In post-emergence damping off seedlings emerge then may pale, curl, wilt, and collapse from a rot at soil line and below. The base of stem is generally water-soaked at first then turns gray to brown or black then rots.
Vegetable seedlings often do not grow well under humid conditions, particularly if soil is cold and wet. Damping off fungi flourish in moist, unhygienic conditions. The disease often starts at one end of a seed tray, and quickly spreads to other end. A fluffy fungal growth may also appear on soil surface as well as on dead seedlings.