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Nematode Population Threshold Levels

  • N. G. Ravichandra
Chapter

Abstract

Although hundreds of different nematode species are associated with plants, not all are plant parasites. In several cases, phytonematode populations occur in numbers too small to cause serious plant injury. Limited information is available regarding potential economic losses associated with synergistic and antagonistic interactions between nematode species and the involvement of them in disease complexes. The evaluation of population threshold levels and the damage is of much significance. Nematodes from soil samples or infected plant parts must be extracted, identified, and counted in order to determine if one or more nematode species are causing poor plant growth. Hence, much emphasis has been given to the characterization of host sensitivity, host efficiency, and models in terms of population counts (Barker et al. 1985); with regard to host sensitivity, the development of tolerance limits or damage thresholds and the maximum number of nematodes that the plant may support without damage have received much attention. Major factors that influence host efficiency are reproduction factor of nematode, the nematode equilibrium density, and the maximum rate of nematode reproduction apart from the final population.

Keywords

Life History Strategy Damage Threshold Nematode Species Damage Function Nematode Population 
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 2014

Authors and Affiliations

  • N. G. Ravichandra
    • 1
  1. 1.AICRP (Nematodes) Department of Plant PathologyUniversity of Agricultural SciencesBangaloreIndia

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