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Nematode pest of crops : cereals : Rice



A. Rice root-knot nematode, Meloidogyne graminicola 

Symptoms

          Infected Nursery                              Tip Galls

    Aboveground symptom

  • Stunted growth of seedlings in nursery and main field.
  • Yellowing of foliage, chlorosis and patchiness are common symptoms. .
  • Heavily infested plants flower and mature early.
  • Reduction in number of tillers.
  • Size of earhead and number of grains are reduced .

    • Belowground symptom

  • Characteristic tip galling or terminal galls on root.
  • Adult females and egg masses are developed inside the root.

    • Note: Nursery seedlings are highly infested. Commonly found in Aerobic and direct seeded rice.

Management
Treated and Untreated                                                                Soil Solarization  
  • Flooding of field and keeping the crop always in submerged conditions
  • Raising the rice seedlings in flooded soils.
  • Crop rotation with non-host crops such as daincha.
  • Soil solarization with 25µ LLDP (Low Light Density Polythene) sheets for 3 weeks before preparation of fields.
    • Soaking rice seedling in carbosulfan 0.1% reduces nematode reproduction.

 

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