Black Sooty Mold on Holly: Health Risk and Treatment

After trimming holly bushes covered in black mold, a gardener experienced flu-like symptoms: muscle tightness, out-of-body sensation, vomiting.

Mold Exposure Reaction

Yes, sooty mold spores can cause respiratory/immune reactions in sensitive individuals. The expert confirms personal experience with similar symptoms, sometimes bedridden for days.

Cause and Cure

Cause: Scale or other sucking insects excrete honeydew; sooty mold grows on it.

Treatment:

1. Wear a mask (N95/respirator) during all work.
2. Spray lightweight horticultural oil (SunSpray best) on a sunny day.
3. Black soot flakes off within hours.
4. Repeat 2–3 times as needed.
5. Keep wearing mask while soot flakes.

Outcome

Once insects controlled, mold stops forming and weathers away. No more exposure risk.

Expert insight provided by Melissa.