Why does your Onion Sonic 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 Onion Sonic F1, heavy infestations can damage the shallow root systems, leading to reduced bulb development.
While adults look like small flies, their larvae tunnel into the onion scales. This can cause the bulb to rot and create the appearance of insect activity near the soil line.
If the onions are beginning to decay due to moisture, these flies may be attracted to the fermenting organic matter of the decomposing bulb.
Your plant might also be experiencing one of these issues:
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