https://de.wikipedia.org/w/api.php?action=feedcontributions&feedformat=atom&user=BinaryTedWikipedia - Benutzerbeiträge [de]2025-05-02T01:49:24ZBenutzerbeiträgeMediaWiki 1.44.0-wmf.27https://de.wikipedia.org/w/index.php?title=Pythium&diff=188347586Pythium2006-03-07T16:49:35Z<p>BinaryTed: Removed edit credit</p>
<hr />
<div>'''''Pythium''''' [[root]] rot is a common crop disease caused by a [[water mould]] of the same name. ''Pythium'' damping off is a very common problem in fields and greenhouses where the organism kills newly emerged seedlings (Jarvis, 1992).<br />
<br />
Many <i>Pythium</i> spp., along with their close relatives, <i>[[Phytophthora]]</i> spp. are [[plant pathogens]] of economic importance in [[agriculture]]. <i>Pythium</i> spp. are very generalistic and unspecific in their host range - that is, they infect a large range of hosts (Owen-Going, 2002) - while <i>Phytophthora</i> spp. are very specific, i.e. <i>Phytophthora capsici</i> only infect pepper (<i>Capsicum</i> spp.) and <i>Phytophthora infestans</i> only infect potatoes. For this reason, <i>Pythium</i> spp. are more devastating in the [[root rot]] they cause in field crops, because [[crop rotation]] alone will often not eradicate the pathogen (nor will [[fallowing]] the field, as <i>Pythium</i> spp. are also good [[saprotrophs]], and will survive for a long time on decaying plant matter). However, the damage <i>Pythium</i> spp. does in field crops is limited to the area affected, because the motile zoospores need ample surface water to travel long distances as the capillaries formed by soil particles act as a natural filter. In [[hydroponic systems]] inside [[greenhouses]], where extensive [[monocultures]] of plants are maintained in plant [[nutrient solution]] (containing nitrogen, potassium, phosphate and micronutrients) that is continuously [[recirculated]] to the crop, <i>Pythium</i> spp. cause extensive and devastating root rot (Jarvis, 1992). The root rot affects entire operations (tens of thousands of plants, in many instances) within two to four days (Owen-Going, 2002, Owen-Going <et al</i>., 2003).<br />
<br />
====References====<br />
Jarvis, W.R. 1992. Managing diseases in greenhouse crops. APS Press, St. Paul, Minn.<br />
<br />
Owen-Going, T.N. 2002. Etiology and epidemiology of <i>Pythium</i> root rot in bell pepper (<i>Capsicum annuum</i> L.) in commercial-scale and small-scale hydroponic systems. M.Sc. thesis, University of Guelph, Guelph, Ontario.<br />
<br />
Owen-Going, T.N.; Sutton, J.C.; Grodzinski, B. 2003. Relationships of <i>Pythium</i> isolates and sweet pepper plants in single-plant hydroponic units. Canadian Journal of Plant Pathology, 25:155-167.<br />
<br />
==See also==<br />
*[[Phycomycosis|Pythiosis]]<br />
*[[Water mould]]<br />
*[[Oomycetes]]<br />
*[[Phytophthora]]<br />
*[[Hydroponics]]<br />
{{protist-stub}}<br />
<br />
[[fr:Pythium]]</div>BinaryTed