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disease of cabbages, turnips, radishes, and other plants belonging to the family Cruciferae (or Brassicaceae; mustardmustard,
common name for the Cruciferae, or Brassicaceae, a large family chiefly of herbs of north temperate regions. The easily distinguished flowers of the Cruciferae have four petals arranged diagonally ("cruciform") and alternating with the four sepals.
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 family). It is induced by a plasmodial slime moldslime mold
or slime fungus,
a heterotrophic organism once regarded as a fungus but later classified with the Protista. In a recent system of classification based on analysis of nucleic acid (genetic material) sequences, slime molds have been classified in a major group
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 that attacks the roots, causing, in the cabbage, undeveloped heads or a failure to head at all. Clubroot can be partially or in some cases completely controlled by the application of lime (if the soil is very acid), by rotation of crops, and by soil sterilization. The disease is also called finger-and-toe from the swollen shape it gives to roots. Plasmodial slime molds (phylum, or division, Myxomycota) are classified in the kingdom ProtistaProtista
or Protoctista
, in the five-kingdom system of classification, a kingdom comprising a variety of unicellular and some simple multinuclear and multicellular eukaryotic organisms.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a disease attacking the roots of plants of the family Cruciferae, caused by the fungus Plasmodiophora brassicae. Most frequently it damages cabbage. Growths and swellings form on the roots; subsequently they decay and disappear. As a result, the root system develops weakly, and the plant becomes very stunted. The disease is widespread in the USSR and is most harmful in the nonchernozem zone. After the swellings decompose, the fungal spores get into the soil and grow into motile amoeboids that penetrate the roots of plants. After a complex process of development, the amoeboids form plasmodia, which decay and become spores when they reach maturity. The spores are dispersed by implements for tilling the soil, transplants, irrigation, earthworms, and soil insects. The disease develops best in a temperature of 18–24°C and a weak acid soil with 75–90 percent moisture content.

Countermeasures in hot beds and nurseries include the replacement of the contaminated soil or the disinfection of the soil by thermal or chemical treatment. Protective measures in open land include correct crop rotation, the use of hardy varieties, liming the soil, transplanting the seedlings at an early date, and weed eradication.


Gerasimov, B. A., and E. A. Osnitskaia. Vrediteli i bolezni ovoshchnykh kul’tur, 4th ed. Moscow, 1961.
Zashchita ovoshchnykh kul’tur v zakrytom grunte ot vreditelei i boleznei. Moscow, 1969.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(plant pathology)
A disease principally of crucifers, such as cabbage, caused by the slime mold Plasmodiophora brassicae in which roots become enlarged and deformed, leading to plant death.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Check your soil pH, and if needed, adding lime to increase the pH to at least 6.5; closer to 7.0 will help prevent clubroot.
Based on nonchemical control of clubroot, this study focused on the effects of three different treatments on P brassicae, leading to inhibition of the development of clubroot on Chinese cabbage.
The Canola/Flax Agri-Science Cluster and Clubroot Risk Mitigation Project are part of the Canadian government's "Growing Forward" initiative, which will run from April 2010 until March 2013.
Cabbages and swedes were tested for clubroot, which causes the roots to swell and burst, reducing crop yield.
In addition, they will fumigate with new natural compounds to control Fusarium wilt on melons, root rot on strawberries, Phytophthora root rot on citrus, replant syndrome on apples, clubroot on cabbage, and damping-off on vegetable crops.
The smaller-leaved hybrid broccoli and self-blanching cauliflower does well--and there's no chance for them to get clubroot. Peppers are good.
Key track: In the Twilight For fans of: Clubroot, ID3 THE PROTOTYPES Another duo, The Prototypes share their name with a UK indie rock band most known for having a track on FIFA.
A sprinkling of lime in the planting hole when setting out cabbage, broccoli and cauliflower helps control clubroot, and a light application watered into the tomato patch guards against blossom-end rot.
Cauliflowers can also be prone to clubroot disease, a fungal infection which attacks the plant through the soil via its root hairs.
Avoid plants that have been allowed to dry out or have large swellings on the roots, as this could be clubroot, a serious soil-borne disease.
Have seed companies really made progress in stopping blight, mildew, clubroot and other devastating diseases?