clubroot

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clubroot,

disease of cabbages, turnips, radishes, and other plants belonging to the family Cruciferae (mustardmustard,
common name for the Cruciferae, 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 ?
Club root could |force you to move your cauliflowers
Walking into a field is not always easy but being knowledgeable about club root could help you get permission.
If they are misshapen with little knobs on them, club root has invaded your cabbage patch.
Club root is the most serious, remaining in the soil more or less forever, the leaves discoloured and wilting, roots distorted and swollen.
I'm also particularly proud of our brassicas this year, which, despite being planted much later than the recommended time for over-wintering and succumbing to club root, have produced an enormous crop of tender-stem broccoli.
Meanwhile, Carole Baxter visits George Anderson's own garden to battle the dreaded club root.
This year has been a terrible one for club root for many people.
Q MY cabbage patch was a failure this year due to club root.
Wet acid soil is a breeding ground for club root, which is extremely difficult to get rid of and can make it impossible to grow any members of the cabbage family (Brassicas) on the site for years.
It does help to sweeten acid soil, provides a small amount of phosphorus (1-2%) and potassium (3-7%), and can be helpful in the fight against the cabbage and onion root maggot (spread a ring of ashes round each plant at planting time and renew after watering or rain), and may aid in the prevention of the soil-borne fungus club root which can infect broccoli plants (mix the ashes into the soil around the base of each plant).
Club root, so named because infected roots are swollen and stubby, is the scourge of the brassica family - cabbage, cauliflower and brussels sprouts.
It is not wise to sow it amongst other slow-growing brassica crops as this may increase the incidence of Cabbage White butterflies, cabbage root Fly and club root disease.