White Sticky Globules on Rosemary: Aphids, Mites, or Powdery Mildew?

Diagnosis

• Aphids/mites – leave sticky honeydew; treat with insecticidal soap.
• Powdery mildew – white blotches on foliage; treat with copper fungicide.

No leaf holes? Likely powdery mildew.

Treatment

1. Spray copper fungicide (e.g., Soap Shield, Cueva) per label—repeat weekly.
2. If unsure, add insecticidal soap; both can be used together.
3. Improve air circulation; avoid overhead watering.

Why It Matters

Rosemary is tough but mildew weakens it. Early control prevents spread to other herbs.