Why does your Pelargonium cordifolium have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The presence of tiny black flies is most likely the larvae or adults of fungus gnats, which thrive in the moist organic matter found in Pelargonium potting soil. The adults emerge to lay eggs in the top layer of substrate, while the larvae feed on fungal mycelium and can damage delicate root hairs.
Frequent watering or lack of drainage in Pelargonium pots creates a perpetually damp environment that attracts fungus gnats and encourages mold growth. This excess moisture weakens the plant's root system, making it more susceptible to secondary infections.
If using a high-compost potting mix, the decomposition process can attract various small flies seeking nutrients. As organic material breaks down, it provides an ideal breeding ground for many insect species common in indoor Pelargonium cultivation.
Your plant might also be experiencing one of these issues:
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