China Girl Holly: Aphids, Sooty Mold, and Fly Attraction

Holly bushes had flies last year (treated with Sevin). Leaves turned black. Now white spots (¼ inch) on back of black leaves.

Diagnosis

Aphids produce honeydew → attracts flies → sooty mold grows on honeydew (black leaves). White spots likely aphid cast skins or egg masses.

Integrated Control

1. Blast with water to dislodge aphids.
2. Let dry, then spray insecticide.
3. Rotate products every 10–14 days:

• Aggressive: acephate (Ortho Systemic), acetamiprid (Ortho Max).
• Maintenance: insecticidal soap (Safer), neem oil (Safer BioNeem, Bonide Bon-Neem), malathion (Green Light).

Key

Repeated applications essential. Monitor daily; treat at first reappearance.

Expert insight provided by Steve.