Why does your Cucumis sativus have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe tiny black flies are likely fungus gnat adults, which thrive in the moist organic matter of cucumber soil. Their larvae feed on decaying roots and can cause root damage, indirectly weakening the plant.
Certain species of small, dark beetles can be mistaken for flies when seen at a distance. These pests feed on cucumber leaves and flowers, creating characteristic 'shothole' patterns in the foliage.
Similar to fungus gnats, sciarid flies are attracted to overly damp cucumber substrate. They can cause minor damage, but their presence is primarily an indicator of poor drainage or overwatering.
Your plant might also be experiencing one of these issues:
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