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Mites (mainly the red spider mite Tetranychus and broad mite Polyphagotarsonemus latus) build up on pineapple in hot, dry weather. Damage shows as fine yellow stippling on leaves, sometimes with visible webbing in severe cases. Broad mite also distorts young leaves and can damage fruit skin. Mite outbreaks are often triggered by broad-spectrum insecticide sprays that kill predator mites. Regional priority: Moderate to high during dry season across all regions; higher on blocks with heavy insecticide history.

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When pineapple is most vulnerable

During prolonged hot-dry weather at any phase. Broad mite damage on young leaves is most damaging at early vegetative; spider mite damage on canopy leaves peaks at late vegetative and fruit development.

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How mites show in satellite data

  • Not detectable at Sentinel scale in early stages.
  • Advanced infestations cause block-wide slight NDVI shortfall in dry weather; hard to separate from drought.
  • Ground scouting with a 10x hand lens is essential for detection.

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Field symptoms

  • Fine yellow stippling on leaf surfaces
  • Bronzing in advanced spider mite infestation
  • Fine webbing on leaf undersides (spider mite)
  • Distorted, cupped young leaves (broad mite)
  • Russeting or bronzing on fruit skin if broad mite feeds on developing fruit
  • Confirm with hand lens - spider mites are 0.5 mm red-orange dots; broad mites are 0.2 mm and nearly invisible without magnification

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Reduce the damage by

  • Conserve predators - avoid broad-spectrum pyrethroids and carbamates that kill predator mites (Phytoseiulus, Amblyseius).
  • Miticide when threshold is met - abamectin, spiromesifen, or bifenazate. Rotate modes of action.
  • Water-stress management - well-irrigated blocks have lower mite pressure.
  • Overhead irrigation briefly disrupts mite populations on the leaf surface.
  • Scout during dry spells - every 2 weeks with a hand lens, focus on leaf undersides and the center whorl.
  • Threshold - action at more than 10 spider mites per D-leaf, or any observable broad mite damage on young leaves.
  • Do not apply sulfur in hot weather - phytotoxic on pineapple.

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Set an alert for early warning

Turn the diagnosis into a trigger. Mite outbreaks track hot-dry weather, so use a weather trigger plus a scheduled hand-lens scout.
Recommended settings for mites on pineapple:
  • Weather alert - 14 or more consecutive days above 30 C with rainfall below 20 mm triggers a mite scout.
  • Post-insecticide alert - schedule a mite scout 3 weeks after any broad-spectrum insecticide application.
  • Broad mite alert - flag any block where young leaves show cupping distortion for immediate hand-lens inspection.