Spider Mite Identification Guide
Spider mites are often grouped together as "red spider mite", but several different species occur in horticultural crops.
Correct identification helps explain differences in crop preference, biology and risk.
Quick Species Comparison
| Species | Typical Colour | Webbing | Main Crops |
|---|---|---|---|
| Tetranychus urticae | Green, yellow, orange or red | Heavy | Most protected crops |
| Tetranychus cinnabarinus | Deep red | Heavy | Ornamentals, bedding plants |
| Panonychus ulmi | Bright red | Minimal | Apples, pears, plums |
| Panonychus citri | Red-purple | Minimal | Citrus |
Two-Spotted Spider Mite (Tetranychus urticae)
Common names: Two-Spotted Spider Mite, Red Spider Mite
The most important spider mite species in UK protected horticulture.
Key features:
- Two dark spots visible on body
- Variable colour
- Produces webbing
- Extremely broad host range
Carmine Spider Mite (Tetranychus cinnabarinus)
Common names: Carmine Spider Mite
Key features:
- Deep red coloration
- Closely related to Tetranychus urticae
- Heavy webbing under high populations
- Common on ornamentals and bedding plants
Some authors consider it a separate species while others treat it as part of the Tetranychus urticae species complex.
Fruit Tree Red Spider Mite (Panonychus ulmi)
Common names: Fruit Tree Red Spider Mite, European Red Mite
Key features:
- Bright red colour
- Little or no webbing
- Common in orchards
- Important pest of apples and pears
Citrus Red Mite (Panonychus citri)
Common names: Citrus Red Mite
Key features:
- Red-purple appearance
- Primarily associated with citrus
- Little webbing
- Often found on leaves and fruit