Diagnosing Butterfly Bush Decline: Mites vs. Transplant Shock

A newly planted butterfly bush (Buddleia) developing brown leaf spots and wilting despite irrigation and pesticide treatment presents two likely diagnoses requiring different solutions.

Spider Mite Diagnosis

• Check leaf undersides with 10x hand lens for tiny moving specks.
• Look for fine webbing at leaf-stem junctions.
• Stippling (white/yellow dots) on upper leaf surfaces.

Treatment: Apply registered miticide (not insecticide) to leaf undersides. Repeat in 7 days.

Transplant Shock Alternative

If no mites are found, symptoms indicate root establishment failure:

• Water deeply 2-3 times weekly (not daily light watering).
• Apply granular low-N fertilizer at half rate.
• Mulch 3 inches, keep away from crown.
• Provide temporary afternoon shade if in full sun.

Key Differentiators

• Mites: worst on oldest leaves, webbing present, spreads upward.
• Shock: uniform wilting, new growth affected first, no webbing.

The adjacent healthy butterfly bush suggests site-specific issues (root damage at planting, soil variation) rather than a widespread pest problem.