Bee Balm Powdery Mildew: Cultural Control First, Fungicide If Needed

Carroll's bee balm (Monarda) shows powdery mildew on lower leaves.

Why Bee Balm Gets Mildew

Monarda is highly susceptible. Dense growth, shade, overhead watering, and poor air flow create ideal conditions.

Cultural Management (Often Sufficient)

• Water at soil level, morning only.
• Remove infected leaves: Bag/discard—don't mulch with them.
• Thin stems: Improve air circulation.
• Full sun: Minimum 6 hours.
• Deadhead spent blooms: Prevents premature season end and dieback.

If Cultural Controls Fail

• Spray fungicide on cloudy day (protect bees). Avoid flowers.
• Options: sulfur, potassium bicarbonate, neem oil, or synthetic (myclobutanil).

Alternative: Spittlebugs

If "frothy substance" not powder, it's spittlebugs. Blast off with strong water jet—mainly cosmetic nuisance.

Bee balm usually rebounds well with improved culture.