Webbing and Black Eggs on Rosemary: Insect Identification Needed

Webbing and Black Eggs on Rosemary: Insect Identification Needed

Fine webbing and tiny black eggs on rosemary suggest spider mites or a small caterpillar/pest complex. The black specks may be frass (insect droppings) rather than eggs. Accurate identification is essential for effective control.

Next Steps

1. Examine leaves for stippling (mites) or chewing damage (caterpillars).
2. Place a white sheet under a branch and tap; mites appear as moving specks.
3. Submit a sample to your county Extension office for definitive ID and treatment recommendations.
4. Alternatively, email a clear, close-up photo to a plant diagnostic clinic.

In the meantime, increase air circulation, avoid overhead watering, and spray with insecticidal soap if mites are suspected.