Black Sticky Spots on Lilies: Aphids/Thrips + Sooty Mold or Botrytis

Two Likely Culprits for Oily Black Deposits

1. Aphids or Thrips + Sooty Mold

• Insects suck sap → excrete honeydew → black mold grows on it.
• Check leaf undersides for tiny green/black aphids.
• Shake leaves over paper; use magnifier for thrips.
• Ants farming aphids = sure sign.

2. Botrytis / Anthracnose (Fungal)

• Fuzzy gray/brown spores on dead tissue.
• Fungicides (chlorothalonil, copper) treat.

Action Plan

1. Identify pest vs. fungus.
2. Insects: horticultural soap, neem, or Ortho/Bayer insecticides (organic preferred).
3. Fungus: fungicide + sanitation (remove dead leaves).
4. If unsure: County Extension lab ID (give location for contact).

Early detection saves lilies.