Why does your Rosmarinus officinalis Prostratus have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
These flies thrive in the consistently moist organic matter required by prostrate rosemary when overwatered. The larvae live in the top layer of soil and feed on decaying organic material and occasionally fine root hairs.
The flies may be attracted to the scent of decaying plant tissue caused by Phytophthora or similar water molds. Prostrate rosemary is highly susceptible to root rot if its substrate does not drain rapidly.
If the soil contains heavy compost or peat that stays anaerobic, various small Diptera species migrate to the plant to lay eggs. This is common in prostrate varieties kept in decorative pots with poor aeration.
Your plant might also be experiencing one of these issues:
English
Italiano
