Why does your Onion Teon 307 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 organic matter of the soil and feed on fine root hairs of onion bulbs, which can lead to stunted growth or rot. The presence of tiny black flies near the base of your Onion Teon 307 F1 is a classic sign of an infestation in overly moist growing media.
While the larvae are the primary destructors of onion bulbs, the adult flies are often seen hovering around the crop during planting and early growth stages. They lay eggs near the neck of the onion, which can lead to catastrophic bulb decay in high-value hybrids like Teon 307.
If your Onion Teon 307 F1 is in a container with decomposing organic matter or nearby rotting vegetation, these flies may be attracted to the moisture and fermentation. While they do not directly attack the onion bulbs, their presence indicates high humidity levels that can promote secondary fungal pathogens.
Your plant might also be experiencing one of these issues:
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