Why does your Nephrolepis obliterata have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe larvae of fungus gnats live in the top layer of soil, feeding on organic matter and decaying plant roots. The presence of tiny black flies around a Boston Fern is most often due to frequent overwatering which creates the moist environment these insects crave.
While not a direct cause of flies, constant dampness in the Boston Fern's substrate promotes fungal growth that serves as the primary food source for fungus gnat larvae. This also leads to root hypoxia, weakening the plant's ability to resist pests.
Boston Ferns are high-maintenance; if old fronds are allowed to rot against the soil surface, they provide an ideal breeding ground for small flies. This accumulation of organic debris creates a perfect micro-habitat for insect life cycles.
Your plant might also be experiencing one of these issues:
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