Pests
Thrips
Identify Thrips: symptoms, possible causes, prevention, and practical actions for 3 affected plants. Silvery-grey speckles on leaves
Editorial diagnosis
Diagnosis overview
Thrips are tiny slender insects that rasp and suck leaves and flowers, leaving silvery marks.
In gardens, Thrips can occur on plants including Shallot, Allium ramosum, Winter Heath Onion. In the available profiles, it is linked mainly with Alliums, Herbs.
The recorded risk level is medium. Check young leaves and flowers early because damage remains visible.
Inspect leaf undersides, shoot tips, and the soil around the plant at different times of day. Eggs, larvae, droppings, webbing, or slime trails are often more diagnostic than one damaged leaf.
A common mistake is to treat feeding damage without checking the animal, eggs, larvae, time of activity, and affected plant parts.
At a glance
Plants
3
Category
Alliums, Herbs
Risk
medium
Scientific name
Thrips tabaci
Typical signs
- Silvery marks
- Black specks
- Distorted leaves
- Flower damage
Possible confusion
- Similar feeding damage: Always check for insects, droppings, slime, mines, holes, or residues. The damage pattern alone is often not enough.
Immediate actions
- Inspect affected parts and remove where useful
- Stabilise the plant and reduce stress
- Keep monitoring the planting
Prevention
- Encourage vigorous plants
- Monitor regularly
- Support beneficials and diversity
- Adapt care to weather and site