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Thrips (mainly Frankliniella and Thrips species) rasp leaf and fruit surface tissue and feed on the released cell contents. On pineapple the main damage is silver flecking on leaves and fruit, plus fruit scarring and transmission of Pineapple Yellow Spot Virus (PYSV) in some regions. Thrips populations spike in hot, dry weather. Regional priority: High in Hawaii, Philippines, Taiwan, and Australia (yellow spot virus vector). Moderate elsewhere as a direct feeding pest.

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When pineapple is most vulnerable

At forcing to fruit set (months 12 to 15) - thrips feeding at floral induction causes fruit scars and knobs that persist to harvest. Also at early vegetative where PYSV is a concern.

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How thrips show in satellite data

  • Not detectable at Sentinel scale.
  • Population dynamics track dry-hot weather; use weather forecast as the leading indicator.

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Field symptoms

  • Silver flecking on leaf surfaces and fruit shells
  • Small, black frass dots on the flecked surfaces
  • Fruit scarring and knobbing if feeding was heavy at fruit set
  • Distorted young leaves in advanced infestation
  • Yellow spot symptoms where PYSV is present - yellow leaf spots that expand to necrotic patches, plant collapse
  • Best confirmed by tapping a leaf whorl over a white tray and counting the small yellow-brown insects

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Reduce the damage by

  • Pre-forcing spray - a single spinetoram or abamectin application before floral induction protects the developing fruit.
  • Scout with white tray beat sampling every 2 weeks during dry weather.
  • Threshold - action at more than 5 thrips per whorl during forcing to fruit-set window.
  • Silver mulch deters thrips landing compared with black mulch.
  • Rogue PYSV-symptomatic plants promptly in yellow-spot regions to reduce virus source.
  • Rotate modes of action to slow resistance; thrips resistance develops fast. Spinetoram and abamectin are two groups - a third rotation partner must be chosen from the current register. Methomyl has been banned in Malaysia since 1974 and is not a rotation partner - see Pesticide registration.
  • Avoid broad-spectrum sprays that kill thrips predators (Orius, predatory mites).

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Set an alert for early warning

Turn the diagnosis into a trigger. Thrips peak in hot-dry weather, so combine a weather alert with a scheduled pre-forcing spray reminder.
Recommended settings for thrips on pineapple:
  • Weather alert - 10 or more consecutive days above 30 C with rainfall below 20 mm triggers a thrips scout.
  • Pre-forcing reminder - schedule a thrips spray 1 week before every forcing application.
  • PYSV follow-up alert - trigger a rogue-and-record walk if yellow-spot symptoms are found on any plant.