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Nematode pest of crops : Vegetables

Nematode pest of Tomato

Root knot nematode : Meloidogyne incognita

  • Root-knot nematode, Meloidogyne incognita which causes 11-35 % yield loss in Tomato. It can be spread through seedlings, planting materials, irrigation water and farm implements.

Symptoms

Above ground symptoms

  • Stunted growth of the plants
  • Disease appearance in patches under field conditions.
  • Leaves show dwarfing, chlorosis, yellowing and retardation of growth.
  • Plants show “Day wilting” symptoms. .

Below ground symptoms

  • Primary galls are small which coalesce to form larger secondary galls.
  • Root system is reduced, severely galled and completely disorganized vascular system.
  • Sometimes the galled tissues are invaded by secondary pathogens and causes root decay.
Infected root of watermelon Root knot affected tomato plants Infected root portion
Root Knot Nematode affected chilli plants and roots

Management

  • Nursery beds raised in nematode free soil and use nematode free planting materials.
  • Soil solarization in nursery beds with white or transparent sheet LLDPE 25 gauge thickness during summer month.
  • Nursery application of AM fungus @ 100g/m2
  • Removal and distraction of nematode affected roots of the previous crop.
  • Deep summer ploughing of field.
  • Application of neem cake @ 250 kg/ha.
  • Crop rotation with non-host crops like mustard, sesame, maize, wheat and millets.
  • Soil application of talc based formulation of Purpureocillium lilacinum @ 2.5 kg/ ha along with 250kg of FYM.

Updated on Jun 2023


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