Why does your Lilium orientalis Columbia have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnats, whose larvae thrive in the moist, organic-rich soil required by Oriental Lilies. They feed on decaying organic matter and can damage the delicate developing root systems of the lily bulbs.
Overwatering creates the anaerobic, damp conditions that attract fungus gnats and promote fungal pathogens. For Lilium orientalis, constant wetness can lead to bulb rot, which provides more food for fly larvae.
An abundance of uncomposted mulch or decomposing peat in the lily pot provides a breeding ground for flies. As this organic material breaks down, it releases CO2 and moisture that attracts adult flies.
Your plant might also be experiencing one of these issues:
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