Why does your Begonia Monza Formula Mixture have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnat adults, which lay eggs in moist organic matter. Their larvae feed on the decaying organic material and fine root hairs of your Begonia Monza Formula, potentially causing root damage.
Fungus gnat populations explode when Begonia soil remains consistently wet. For a rhizomatous species like Monza Formula, high moisture levels at the crown can also lead to rot alongside the fly infestation.
The presence of large amounts of peat moss or uncomposted bark provides an ideal breeding ground for fly larvae. As this organic matter breaks down, it attracts flies looking for a nutrient-rich substrate.
Your plant might also be experiencing one of these issues:
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