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Area of Science:

  • Agricultural Science
  • Plant Pathology
  • Nematology

Background:

  • Plant-parasitic nematodes, such as root-knot (RKN) and cyst nematodes (CN), cause substantial crop yield losses globally.
  • African indigenous vegetables (AIV), including African nightshade (Solanum spp.) and African spinach (Amaranthus spp.), are vital food sources in Africa.
  • The host status of AIV to plant-parasitic nematodes is not well-documented, hindering effective crop management strategies.

Purpose of the Study:

  • To investigate the host status of key African indigenous vegetables (AIV) to root-knot nematodes (RKN) and potato cyst nematodes (PCN).
  • To evaluate the impact of cultivating African spinach and African nightshade on soil populations of RKN and PCN.
  • To assess the potential of AIV as a component of an integrated nematode management system.

Main Methods:

  • Field survey to assess root galling on AIV and presence of PCN cysts in associated soil.
  • Two-year field experiment to study nematode dynamics on selected AIV species (Amaranthus dubius, A. cruentus, Solanum scabrum, S. villosum).
  • Evaluation of AIV effects on RKN and PCN soil infestation by subsequent cultivation of susceptible crops (Solanum lycopersicum, S. tuberosum).

Main Results:

  • Solanum villosum showed high root galling; other AIV exhibited rare to low galling.
  • Cultivation of Amaranthus spp. and S. scabrum significantly reduced RKN soil infestation (>85%) and PCN densities (>80%).
  • Successive cultivation of AIV led to substantial reductions (>75%) in galling index and PCN development on subsequent susceptible crops.

Conclusions:

  • African spinach and African nightshade demonstrate significant potential in reducing populations of RKN and PCN.
  • These AIV can be integrated into cropping systems to manage economically important plant-parasitic nematodes.
  • A novel cropping system utilizing AIV offers an environmentally friendly and productive approach to nematode control.