Why does your Equisetum hyemale have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The presence of tiny black flies in the moist substrate of Equisetum hyemale is most commonly due to fungus gnats. Their larvae thrive in the perpetually damp, organic-rich soil that horsetails require, feeding on decaying matter and fungal mycelium.
If the flies are slightly larger and slower-moving, they may be black soldier flies. They are attracted to the high humidity and decomposing organic material found in the dense, wet rhizome area of the horsetail.
While not a direct cause of flies, heavy infestations of gnats can lead to root damage by larvae, which may manifest as yellowing segments in the stems. This makes the plant more susceptible to further pest colonization.
Your plant might also be experiencing one of these issues:
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