Why does your Onion Precorio F1 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 live in the soil and feed on organic matter and decaying roots. In onion crops like Precorio F1, high infestation can lead to root damage and secondary fungal infections.
If the onion bulbs are beginning to soften or ferment due to moisture, small flies may be attracted to the decaying organic material. This is often a secondary symptom of underlying bulb rot.
Excessive moisture in the growing medium creates the perfect breeding ground for small dipteran insects. Precorio F1 requires well-drained soil, and stagnant water promotes both fly larvae development and root decay.
Your plant might also be experiencing one of these issues:
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