Why does your Hosta kiyosumiensis have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnat adults, which lay eggs in the moist organic matter of the Hosta's potting medium. While adults are a nuisance, their larvae feed on decaying organic matter and can damage the fine feeder roots of Hosta kiyosumiensis.
These flies are attracted to the high moisture levels and decomposing mulch typically found in Hosta beds. They do not directly attack the plant tissue but indicate that the soil surface is staying too wet for too long.
While less common as 'flying' pests, certain aphid species can appear as small dark insects crawling near new growth. They suck sap from the tender hosta leaves, which can lead to leaf distortion and secondary fungal growth.
Your plant might also be experiencing one of these issues:
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