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The suppression of a soilborne plant pathogen by resident soil organisms is called

  • A.Chemical fumigation
  • B.Liming to raise pH
  • C.Biological control
  • D.Soil solarisation

Answer: C

Biological control uses living organisms, whether naturally present or deliberately introduced, to hold a pathogen below damaging levels. Solarisation and fumigation kill by heat and chemicals respectively, and liming corrects acidity.

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