Spider Mites — UK Commercial Species Index
Spider mites are important sap-feeding pests that damage leaves by piercing plant cells and removing their contents.
Heavy infestations can reduce photosynthesis, weaken plants, cause leaf drop and reduce crop quality and yield.
Correct identification matters because different mite species vary in host range, environmental preference and biological control suitability.
Quick Species Comparison
| Species | Main Crops | Webbing | UK Importance |
|---|---|---|---|
| Two-Spotted Spider Mite (Tetranychus urticae) | Strawberries, cucumbers, ornamentals | Heavy | Very High |
| Carmine Spider Mite (Tetranychus cinnabarinus) | Ornamentals, protected crops | Moderate | Moderate |
| Fruit Tree Red Spider Mite (Panonychus ulmi) | Apples, pears, plums | Little | High |
| Citrus Red Mite (Panonychus citri) | Citrus, conservatories | Little | Moderate |
Two-Spotted Spider Mite (Tetranychus urticae)
Common names: Two-Spotted Spider Mite / Red Spider Mite
Scientific name: Tetranychus urticae
The most important spider mite species in UK protected horticulture.
Common hosts include:
- Strawberries
- Cucumbers
- Tomatoes
- Peppers
- Ornamentals
- Herbs
- Soft fruit
Produces characteristic webbing under heavy infestations.
Carmine Spider Mite (Tetranychus cinnabarinus)
Common names: Carmine Spider Mite
Scientific name: Tetranychus cinnabarinus
Closely related to the Two-Spotted Spider Mite (Tetranychus urticae).
Some authors consider Carmine Spider Mite a separate species, while others regard it as a red form within the Tetranychus urticae species complex.
It is occasionally encountered in:
- Ornamentals
- Protected crops
- Bedding plants
- Nursery production
Damage symptoms are very similar to Two-Spotted Spider Mite and management recommendations are generally the same.
Key biological controls include:
Fruit Tree Red Spider Mite (Panonychus ulmi)
Common names: Fruit Tree Red Spider Mite / European Red Mite
Scientific name: Panonychus ulmi
Important pest of orchard crops including apples, pears and plums.
Citrus Red Mite (Panonychus citri)
Common names: Citrus Red Mite
Scientific name: Panonychus citri
Associated mainly with citrus, conservatory plants and specialist protected production.