Spittlebugs on Rosemary and Lavender: Wash and Soap

White frothy globules on herbs = spittlebugs (froghopper nymphs). Harmless but unsightly. Wash off with water, then spray insecticidal soap.

Steps

1. Strong water jet removes froth and nymphs.
2. Apply insecticidal soap to kill remaining.
3. Repeat if froth returns.
4. No conventional insecticide needed.

Spittlebugs rarely damage woody herbs.