Why does your Mini Rose Shiny Cupido have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely Fungus Gnats, whose larvae thrive in the moist organic matter of miniature rose potting soil. They feed on decaying organic material and can damage the delicate root systems of 'Shiny Cupido' by feeding on fine feeder roots.
Miniature roses like 'Shiny Cupido' are highly susceptible to root rot if kept in overly saturated medium. Constant moisture creates the perfect breeding ground for fungus gnat larvae and encourages fungal pathogens.
Using heavy amounts of compost or uncomposted organic fertilizer in miniature rose pots can attract flies. The decomposing nutrients provide an immediate food source for the adult gnats to lay eggs.
Your plant might also be experiencing one of these issues: