Chilli Thrips (Scirtothrips dorsalis) are among the most serious pests affecting roses in Western Australia, particularly during our hot, dry summers. These tiny insects thrive in warm conditions and can quickly damage new growth, foliage, and blooms if not controlled.

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What Are Chilli Thrips?

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Chilli Thrips are a specific species of thrips, distinct from common thrips such as Frankliniella occidentalis or Thrips tabaci. While general thrips attack a wide range of plants, Chilli Thrips are especially aggressive and have a broad host range, including roses, chilli peppers, strawberries, and other ornamentals. They are smaller and more slender than common thrips, making identification challenging without magnification.

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Damage Symptoms

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Chilli Thrips feed on young leaves and buds, causing:

• Leaf curling and bronzing

• Stunted growth

• Severe defoliation

• Distorted blooms

 

If left unmanaged, infestations can significantly weaken plants and reduce flowering.

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Why Are They a Problem?​

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Unlike common thrips, Chilli Thrips reproduce rapidly and are highly resilient. They spend part of their life cycle in the soil, making complete eradication difficult. However, with vigilance and proper care, they can be managed effectively.

 

Management Strategies​

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While there is currently no eradication method, Chilli Thrips can be controlled through an integrated approach. The Rose Society of Western Australia, in collaboration with industry professionals, recommends:

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• Good summer rose care: Maintain healthy plants by adopting overhead watering, mulching and fertilizing.

• Timely, targeted treatments: Use appropriate insecticides and follow correct spraying practices.

• Understanding the life cycle: Pay attention to soil stages and treat accordingly.

• Monitoring and prevention: Regularly inspect plants for early signs of damage.

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Healthy, well-maintained roses are more resilient to summer stress and can recover to produce beautiful blooms even Chilli Thrip damage.