Powdery Mildew & Dieback on New Lilacs in Southern Indiana

Diagnosing & Managing First-Year Lilac Problems

Powdery Mildew (Dusty Leaves)

• Cosmetic only—rarely kills.
• Rake all fallen leaves in fall to reduce spores.
• Next year: spray "Green Cure" (organic) at bloom finish.

Tip Dieback (Dead Branches)

• Likely heat/drought stress on immature root system.
• Water deeply weekly (trickle 30 min at base).
• Do NOT fertilize—burn causes identical dieback.
• Wait until spring; prune only truly dead wood.

Long-Term Lilac Care

• Organic fertilizer every 2–3 years.
• Neutral pH (lime/wood ash if soil acidic).
• Test pH via Cooperative Extension.