Why does your Allium cepa Medusa 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 upper layers of the soil and feed on organic matter or fine root hairs. In onion crops like Medusa F1, high infestation can lead to root damage and reduced bulb development.
If there is decaying organic matter or overly fermented plant debris near the onion bed, these flies are attracted to the site. While they don't attack the bulb directly, their presence indicates a moisture-rich environment prone to secondary rot.
While the maggot is a larva, the adult flies are attracted to the scent of wounded onion tissue. If your Medusa F1 plants have existing physical damage, these small flies may be scavenging or looking for oviposition sites.
Your plant might also be experiencing one of these issues:
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