Why does your Allium cepa Novista F1 have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely adults of the fungus gnat species, which thrive in the moist, organic-rich soil required for Allium cepa. While adults are harmless, their larvae feed on decaying organic matter and can damage developing onion root systems by attacking fine feeder roots.
While the flies themselves are not the maggots, certain Diptera species attracted to onion volatiles can lead to infestations. If these flies lay eggs near the bulb, the resulting larvae will tunnel into the Allium cepa scales, causing rot and plant collapse.
The presence of small black flies often indicates that the soil substrate is staying too wet for too long. For Allium cepa varieties like Novista F1, prolonged moisture promotes fungal growth, which serves as the primary food source and breeding ground for gnats.
Your plant might also be experiencing one of these issues:
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