Spider Mites
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About this condition
Spider mites are tiny pests that proliferate rapidly in hot, dry conditions, feeding on leaf undersides and producing fine white or yellow stippling (flecking) on foliage. They are common on bonsai such as pine, maple, and azalea.
Common symptoms
- Fine silky webbing is visible on leaf undersides
- Fine white or yellow stippling (flecking) spreads across the upper leaf surface
- Entire leaves take on a bleached, dull appearance and lose their gloss
- Symptoms can spread rapidly from midsummer through peak summer heat
Common causes
- Rapid mite population increase in hot and dry conditions
- Insufficient watering leading to excessively dry foliage and soil
- Poor air circulation in enclosed growing environments
- Insufficient leaf misting when trees are kept under eaves away from rain
Prevention (growing conditions & routine care)
Water consistently from mid-summer onward and mist foliage regularly to prevent leaf desiccation. Choose a position with good air flow and partial shade to avoid excessive drying. Inspect leaf undersides regularly for early detection.
Related guide
→ Browse the species guide for this animalWhen to see a vet
Monitor; consult a specialist if it worsensWhat can a nursery or grower do?
Specialist bonsai nurseries and growers can advise on identifying mite presence, managing the tree according to its species, and adjusting placement and watering during hot dry periods.
Related columns
- How to Choose a Bonsai Pot | The Basics of Matching Pots to Tree Species and Shape
- Leaf Pruning of Deciduous Bonsai (Hagari) — A Summer Technique to Promote Smaller Leaves and Finer Branching
- Beginner Bonsai: Year-One Growing Schedule by Species
- Bonsai Root Growth and Healthy Root System Development: Root Establishment Management and Repotting Timing
Other problems with this plant
Root RotConsider acting within a few daysPowdery MildewMonitor; consult a specialist if it worsensSooty MoldConsider acting within a few daysAphidsMonitor; consult a specialist if it worsensScale InsectsConsider acting within a few daysLeaf Scorch / Water StressMonitor; consult a specialist if it worsensBorer (Longhorn Beetle Larva)Act promptly (isolate, remove the cause)