Combined Scale and Spider Mite Treatment for Holly with Neem and Horticultural Oil

Combined Scale and Spider Mite Treatment for Holly with Neem and Horticultural Oil

Burford hollies in Nashville, TN sprayed with soapy water. One set has black "mold" stems and dying leaves. Owner asks about cutting to roots or replanting.

Diagnosis

• Black sooty mold on honeydew from scale insects (immobile, waxy bumps).
• Spider mites also likely (fine webbing, stippling).

Do NOT Cut to Roots or Replant

Same pests will attack new plants. Treat existing ones.

Treatment

1. Mix neem oil + lightweight horticultural oil.
2. Spray thoroughly (top, bottom, stems) until dripping.
3. Do not wash off. Let dry.
4. Repeat 3–4× at 7-day intervals.
5. Best timing: Warm (>60°F), cloudy, or no flowers (protect bees).

Monitoring

• Scale dead when water stream dislodges bumps.
• Mites gone when paper tap test is clean.

Hollies often get infested over winter. This regimen works.