Why does your Mini Rose Terrazza Clear have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely adult fungus gnats, whose larvae live in the top layer of moist soil and feed on organic matter. They thrive in the consistently damp substrate often used for miniature roses like 'Terrazza Clear'.
High humidity and overwatered soil create the perfect breeding ground for fungus gnat larvae. For miniature roses, which require well-draining medium, constant wetness promotes the life cycle of these flies.
While not the cause of the flies, the larvae of these insects can damage delicate miniature rose root hairs. This leads to reduced ability for the plant to uptake nitrogen and phosphorus, causing stunted growth.
Your plant might also be experiencing one of these issues:
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