Why does your Begonia coccinea have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely the adult stage of fungus gnats, which thrive in the moist organic matter typically found in Begonia coccinea pots. Their larvae live in the top layers of soil and feed on decaying organic matter and occasionally fine root hairs.
Begonia coccinea prefers consistent moisture but is highly susceptible to root rot from standing water. High humidity and wet topsoil create the ideal breeding ground for fungus gnat populations.
A high concentration of decomposing peat or compost in the potting mix provides a food source for larvae. As this organic matter breaks down, it attracts flies to lay eggs in the substrate.
Your plant might also be experiencing one of these issues:
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