Why does your Chinese Cabbage Blues F1 have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnats, whose larvae thrive in the moist organic matter of cabbage nursery beds. They feed on fine root hairs of Chinese Cabbage, which can lead to stunted growth and yellowing leaves.
Similar to fungus gnats, Sciarids target young Brassica seedlings in overly damp environments. Their larvae consume the root systems of Chinese Cabbage, causing the plant to wilt despite adequate watering.
While less common for foliage, certain fruit fly species are attracted to the fermenting sugars in decaying organic matter around the base of the cabbage. This can lead to secondary fungal issues in the 'Blues F1' cultivar.
Your plant might also be experiencing one of these issues:
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