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Nematode pest of crops : Vegetables

Nematode pest of vegetables

Root knot nematode : Meloidogyne incognita

Hosts: Tomato, Brinjal, Chillies, Bhendi, Snake gourd

Symptoms

  • Presence of galls on the roots (large fleshy galls in Snake gourd, large and firm galls in other vegetable crops, very small galls in chillies).
  • Plants wilt rapidly especially under dry growing conditions and are often stunted.
  • Growth may be retarded and leaves may be chlorotic.
  • In cases where seedlings infection has taken place, numerous plants die in the seed bed and seedlings do not survive transplanting.
  • In those plants that do survive, flowering and fruit production is strongly reduced.
  • The losses caused by Meloidogyne on root and tuber crops like carrot both quantitative and qualitatively, because nematode galling affects marketability.
Infected root of watermelon Root knot affected tomato plants Infected root portion
Root Knot Nematode affected chilli plants and roots

Management

  • Only seedlings with roots free of galls should be selected for transplanting.
  • Application of Pseudomonas fluorescens @10g/m2  in nursery.
  • Crop rotation with non-hosts or resistant crops.
  • Proper weed control
  • Destruction of galled roots after harvest.
  • Soil solarization with clears plastic traps during summer.
  • Use of resistant cultivars.
  • Application of carbofuran 3G @ 1kga.i./ha.

Potato

Potato cyst nematodes : Globodera rostochiensis and G. pallida

Symptoms

  • Yellowing of leaves and stunting of plants
  • Patchy appearance of plant stand.
  • Early senescence and proliferation of lateral roots.
  • Small immature females of white and yellow stages on the roots at flowering.
  • Females can be observed on the tuber surface but with less frequency.
Affected field of potato Golden nematode cysts on roots

Management

  • Long crop rotations of 3-7 years. Members of the Graminaceae and Leguminaceae are crops generally used in these rotations.
  • Use of resistant cultivars
  • Adjusting sowing time to escape from the damage.
  • Use of non fumigant carbofuran 3G @1-2 kg a.i/ha.

 


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