Bonsai Problems & Diagnosis

Work out what is wrong with your bonsai. Browse common problems by symptom and category, each with causes, look-alikes, treatment and prevention.

• Aphids
• Caterpillars & Leaf-Chewers
• Fire Blight
• Fungal Canker & Dieback
• Fungus Gnats
• Insufficient Light (Etiolation)
• Leaf Scorch / Sunburn
• Leaf Spot (Fungal)
• Mealybugs
• Needle Cast / Needle Blight (Conifers)
• Nutrient Deficiency (Chlorosis)
• Over-fertilizing (Fertilizer Burn)
• Overwatering
• Powdery Mildew
• Repot / Transplant Shock
• Root Rot
• Rust
• Scale Insects
• Sooty Mold
• Spider Mites
• Underwatering (Drought Stress)
• Verticillium Wilt
• Vine Weevil
• Whitefly
• Winter / Frost Damage
• Wire Bite / Scarring