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What are the harmful effects of weeds?

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Harmful effects of weeds are;

  • Weeds lower the quality of pastures eg lantana camara
  • Aquatic weeds affect fishing
  • Some weeds are poisonous to man and livestock eg Datura stramonium
  • Some e.g witch weeds (spiga sp) are parasitic to cultivated crops eg maize
  • Some weeds lower the quality agricultural produce
  • Some weeds act as alternate host for insect pest and others for diseases eg wild oats its an alternate host for rust.
  • Some weeds are allelopathic ie produce poisonous substances that may suppress the growth or germination of cultivated crops.

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