Why does your Brassica chinensis have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnats, which thrive in the moist, organic-rich soil required by Pak Choi. While adults are a nuisance, their larvae feed on organic matter and can damage delicate developing root systems.
The presence of black flies often indicates a high population of larvae in the soil. These larvae can cause secondary symptoms like wilting or yellowing in Pak Choi by consuming the root tissues.
If the flies are hovering around the tender leaves or petioles of the Pak Choi, they may be seeking moisture or laying eggs in decaying plant matter. This is less common than fungus gnats but can occur in humid greenhouse environments.
Your plant might also be experiencing one of these issues:
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