Why does your Onion Boreas F1 have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The larvae of fungus gnats live in the organic matter of the soil and feed on decaying roots, which can weaken the developing bulb of your Boreas onion. The adults emerge to lay eggs in the moist upper layers of the onion bed.
While the adults look like small flies, they are highly destructive pests that lay eggs near the onion base; the larvae then burrow into the bulb, causing rot. This is a primary concern for Allium species during the growth phase.
Certain small dark flies are attracted to the moisture and decaying organic matter often found in onion beds, though they may not be directly feeding on the Boreas bulb itself.
Your plant might also be experiencing one of these issues:
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