clubroot

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.
..... Click the link for more information. 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
..... Click the link for more information. 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.
..... Click the link for more information. .

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.

单词	clubroot
释义	clubroot club·root or club root C5444700 (clŭb′ro͞ot′, -ro͝ot′)n. A disease of cabbage and related plants, caused by a parasitic protist (Plasmodiophora brassicae) and characterized by knobby or club-shaped swellings on the roots and wilting, yellowing, and stunted growth of aboveground parts. clubroot (ˈklʌbˌruːt) n (Plant Pathology) a disease of cabbages and related plants, caused by the fungus Plasmodiophora brassicae, in which the roots become thickened and distorted club•root (ˈklʌbˌrut, -ˌrʊt) n. a disease of plants of the cabbage family characterized by swollen roots, caused by a slime mold, Plasmodiophora brassicae. [1840–50] clubroot 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. ..... Click the link for more information. 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 ..... Click the link for more information. 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. ..... Click the link for more information. . 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. ThesaurusSeePlasmodiophora brassicae
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clubroot

club·root

clubroot

club•root

clubroot

clubroot,

Clubroot

REFERENCES

clubroot