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Diseases

Thrips: How to Get Rid of Them Effectively

Complete guide to identifying and eliminating thrips on your plants. Natural, chemical and preventive methods.

(updated on ) 3 min read
Close-up of a plant leaf damaged by thrips

By SPRAIA editorial team · Method: botanical sources, field feedback and editorial validation

Thrips are one of the most dreaded pests by plant collectors. These tiny insects (1-2 mm) feed on your plants’ sap and can cause major damage in record time. Good news: with the right methods, you can wipe them out.

Recognising thrips

What do they look like?

Thrips are tiny elongated insects (1-2 mm), white to beige as larvae and brown to black as adults. They have fringed wings but mostly move by jumping. Their wingless larvae are the most voracious.

Characteristic damage

  • Silvery patches on leaves (cells emptied of content)
  • Tiny black dots (excrement) on top and bottom of leaves
  • Deformed, curled or shrivelled leaves
  • Slowed or stopped growth

SPRAIA tip: photograph the damage and our AI identifies the problem in seconds. Often more reliable than the naked eye.

If you also see yellowing leaves, thrips could be the cause.

Most affected plants

  • Monstera and Philodendron
  • Alocasia (Alocasia guide)
  • Ficus (elastica, lyrata)
  • Orchids
  • Flowering plants (thrips love pollen)

En pratique, étape par étape

Complete protocol from spotting to eradicating a thrips infestation over 6-9 weeks.

Durée : 45 min Matériel : Olive-oil-based Castile soap, Cold-pressed neem oil, Blue sticky traps, Lukewarm non-hard water Outils : Clean spray bottle, Bright lamp to inspect leaf undersides

  1. Confirm the diagnosis

    Inspect undersides of leaves under bright light. Look for silvery patches, black dots (excrement) and tiny elongated insects. A close-up photo analysed by SPRAIA confirms ID quickly.

  2. Isolate affected plants

    Move infested plants away from the rest of the collection immediately. Thrips spread fast, especially on Monstera, Alocasia, Ficus and orchids.

  3. Shower the plant in lukewarm water

    Run the plant under lukewarm water to dislodge as many adults and larvae as possible. Focus under leaves. Let dry a few hours before next step.

  4. Spray Castile soap solution

    Mix 1 tbsp Castile soap in 1 L lukewarm water. Spray generously top and bottom. Let act 30 min then rinse with clean water.

  5. Set up blue sticky traps

    Place blue traps near infested plants: they catch winged adults and let you monitor progress. Always combine with direct treatment.

  6. Renew every 3-4 days for 3 weeks

    Castile soap doesn't kill eggs. To break the breeding cycle (2-3 weeks depending on temperature), treat 3 full cycles, i.e. 6-9 weeks minimum, without slacking.

  7. Switch to neem oil if persistent

    If after 3 weeks of soap the infestation continues, switch to 5 mL neem oil + a few drops of soap in 1 L water, sprayed in the evening once a week for 4 weeks.

Method 1: Castile soap (natural)

Castile soap is the first line of defence and the preferred eco-friendly method.

Recipe: 1 tbsp liquid Castile soap + 1 L lukewarm water + optional drops of neem oil.

Application: spray generously top and bottom, let sit 30 min, rinse, repeat every 3-4 days for 3 weeks minimum. The soap suffocates larvae and adults but doesn’t kill eggs — repetition is key.

Method 2: blue sticky traps

Thrips are attracted to blue (unlike fungus gnats attracted to yellow).

  • Place blue traps near infested plants
  • They mainly catch winged adults
  • Useful for monitoring infestation scale
  • Combine with direct treatment

Method 3: neem oil

Neem oil is a natural insecticide that disrupts thrips’ reproductive cycle.

Recipe: 5 mL pure neem oil + 1 L lukewarm water + a few drops of soap (emulsifier).

Application: mix well, spray in the evening (neem degrades in light), cover the whole plant, repeat weekly for 4 weeks.

Method 4: biological predators

For large collections or severe infestations:

  • Amblyseius cucumeris — predatory mites that devour thrips larvae
  • Orius laevigatus — predatory bugs eating all stages
  • Steinernema feltiae — nematodes applied to soil for pupating larvae

Order online and release directly on plants. The most ecological method.

Prevention: avoiding thrips’ return

The best treatment is prevention:

  1. Inspect every new plant for 2 weeks before adding to your collection
  2. Shower your plants once a month — thrips hate water
  3. Maintain high humidity (>60 %) — thrips thrive in dry air
  4. Clean leaves regularly with a damp cloth
  5. Monitor undersides of leaves regularly, especially new growth

How long to get rid of them?

A complete thrips cycle lasts 2-3 weeks depending on temperature. So treat for at least 3 cycles (6-9 weeks) to be sure all generations, including eggs, are eliminated. Don’t drop your guard too soon.

Conclusion

Thrips are persistent but with consistency you’ll beat them. SPRAIA helps you set treatment reminders, track progress with photos, and document what works for your plants. Speed is key: the earlier you act, the less damage.

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