Non-pathogenic Strains

  • P. Parvatha Reddy


Non-pathogenic (avirulent) or low virulent (hypovirulent) strains are capable of colonising infection site niches on the plants’ surfaces and protecting susceptible plants against their respective pathogens. Such phenomena have been demonstrated for a considerable number of plant pathogens (Agrobacterium spp., Rhizoctonia spp., Fusarium spp. and Pythium spp.). Non-pathogenic strains of various pathogens are potential candidates for development of biocontrol preparations. Some strains are already used in agriculture. The modes of protection differ amongst the non-pathogenic strains, and one strain can protect by more than one mechanism. Competition for infection sites or for nutrients (such as carbon, iron) as well as induction of the host plant resistance have been demonstrated for several pathogens such as Rhizoctonia spp., Fusarium spp. and Pythium spp. Mycoparasitism was shown for Pythium spp. The non-pathogenic Fusarium oxysporum is easy to mass-produce and formulate, but application conditions for biocontrol efficacy under field conditions have still to be determined.


Biocontrol Agent Fusarium Wilt Crown Gall Induce Systemic Resistance Vegetative Compatibility Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer India 2012

Authors and Affiliations

  • P. Parvatha Reddy
    • 1
  1. 1.Indian Institute of Horticultural ResearchBangaloreIndia

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