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Roots

Root-Knot Nematodes on Papaya

Commonly affects: Carica papaya (Papaya)

The tree shows general decline, yellowing, and stunted growth despite adequate care. Roots show small knotted galls along their length when examined.

Potential Causes

  1. 1Root-knot nematodes feeding on root tissue and forming galls
  2. 2Sandy soil, which nematodes move through and colonise easily
  3. 3Continuous papaya cultivation in the same soil without rotation

Solution Steps

  1. 1Improve soil organic matter to support beneficial, nematode-suppressing soil organisms
  2. 2Solarise soil with clear plastic over a hot summer before replanting in severely infested areas
  3. 3Rotate out of papaya production in heavily infested beds for a season or more
  4. 4Start new plantings with nematode-free potting mix if growing in containers

Prevention Tip

Building organic-matter-rich soil supports the beneficial organisms that naturally suppress nematode populations over time.

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