Why does your Leek Mako Nice F1 have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnat adults, which thrive in the moist organic matter required by Leeks. Their larvae feed on decomposing roots and can cause secondary root damage to the Mako Nice F1 cultivar.
Certain species of small flies lay eggs in the soil near the stem base; if larvae migrate to the Leek's bulb area, they can cause rot. This is more common in high-nitrogen soils used for intensive vegetable production.
Overly saturated soil in Leek beds creates a breeding ground for Sciaridae flies. The constant moisture prevents the leek stalks from hardening properly and attracts these pests.
Your plant might also be experiencing one of these issues:
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