Why does your Brassica Pigeon F1 Round White 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 or fine root hairs, which can damage the developing root system of your cabbage. The small black flies seen hovering near the soil surface are the adults.
While typically associated with fruit, certain species are attracted to the fermenting organic matter in overly moist Brassica soil or decaying cabbage leaves. They do not directly attack the cabbage head but indicate a high-moisture environment.
These flies thrive in the damp, nitrogen-rich environments common in Brassica cultivation. Their presence often indicates that the soil moisture level is high enough to promote fungal growth, which serves as their primary food source.
Your plant might also be experiencing one of these issues:
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