Why does your Spinacia oleracea have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe tiny black flies are likely adult fungus gnats, which lay eggs in moist soil. The larvae feed on organic matter and can damage the delicate root systems of spinach, leading to stunted growth.
While the flies themselves are seen, they may be adults of species that lay larvae inside the spinach leaves. These larvae create characteristic serpentine tunnels or 'mines' within the leaf tissue.
Excessive moisture in the spinach substrate attracts fungus gnats by promoting fungal growth, which serves as their primary food source. This often coincides with root suffocation in spinach crops.
Your plant might also be experiencing one of these issues:
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