Why does your Allium cepa Verdon F1 have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The larvae of these flies live in the soil and feed on organic matter and fine root hairs of the onion. In Allium species, heavy infestations can damage the developing bulb and compromise the plant's structural integrity.
While the maggots themselves are larvae, the presence of decaying organic matter from onion maggot damage can attract various small flies to the site. The larvae burrow into the bulb, creating entry points for other insects.
If the onion field is near decomposing organic mulch or over-fermenting plant debris, fruit flies may be present. They do not directly harm the Allium bulb but indicate high moisture and decaying matter in the planting bed.
Your plant might also be experiencing one of these issues:
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