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Bacterial Antagonists of Phytonematodes

  • R. K. Walia
  • S. B. Sharma
  • R. Vats

Abstract

Soil is a dynamic natural resource. It forms a thin cover of unconsolidated minerals and organic matter on earth’s surface and functions to maintain the ecosystems on which all life depends (Doran et al.,1996). A myriad of living organisms such as insects, nematodes, bacteria, algae, fungi, earthworms coexist in the soil. The microbial populations of the soil has enormous diversity and as many as 10,000 different species may be found in a single gram of soil (Torsvik et al., 1990). They are responsible. for smooth operation of the biogeochemical cycles in the soil ecosystem. Nematodes are the most abundant metazoans in soil and they are next only to arthropods in species diversity. All these organisms coexist with numerous diverse functions, interrelations, and interactions. Plant parasitic nematodes or phytonematodes are important constraints to agricultural production all over the world. These soil pests are popularly known as the `hidden enemies’ of farmers because of their microscopic size and subterranean habitat. Of all the microorganisms which are known to occur in soil along with nematodes only a few have been identified as potential biocontrol agents of phytonematodes. The published literature indicates that some species of fungi and bacteria are the most common parasites of nematodes (Davies, 1998). Some bacteria are potent antagonists of phytonematodes. These nematode antagonistic bacteria are broadly of two types: (i) bacteria that are pathogenic to nematodes or the nematode disease producing bacteria, and (ii) bacteria whose secretions or metabolic products are harmful to nematodes or the nematode toxin producing bacteria.

Keywords

Cyst Nematode Spore Concentration Nematode Control Paecilomyces Lilacinus Nursery Soil 
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 Science+Business Media New York 2000

Authors and Affiliations

  • R. K. Walia
    • 1
  • S. B. Sharma
    • 2
  • R. Vats
    • 1
  1. 1.Department of NematologyCCS Haryana Agricultural UniversityHisarIndia
  2. 2.International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)PatancheruIndia

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