clubroot


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clubroot,

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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.

Clubroot

 

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.

REFERENCES

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.

E. A. OSNITSKAIA

clubroot

[′kləb‚rüt]
(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.
References in periodicals archive ?
Cabbages and swedes were tested for clubroot, which causes the roots to swell and burst, reducing crop yield.
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.
Methods to control and eradicate clubroot in Saskatchewan canola.
Continue successional sowing of the brassicas in modules, moving on to small pots (8cm) and then to 15cm pots if you are cursed with clubroot before planting out.
A clubroot resistant variety of Brussels sprout called Crispus might be worth a try or you can test out the new hybrid between Brussels sprouts and kale called Brukale Petit Rosy.
If your cabbages have clubroot, which causes leaves of infected plants to turn red or purple, remove affected plants and try growing cabbages elsewhere.
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?
Other projects include a study to combat clubroot, a disease which ruins plants such as turnips, brussels sprouts and oilseed rape and costs industry around pounds 30m a year in lost crops.
A CLUBROOT is best known as a disease of the brassica family, causing the plants to shrivel and weaken.
Cabbage and cauliflower are subject to clubroot, and if this occurs try planting in new soil in a different part of the garden.
Clubroot can hang around the soil for some seven years.