Why does your Apium graveolens have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe tiny black flies are likely fungus gnats, whose larvae live in the upper layers of moist soil and feed on organic matter or root hairs. In celery, high moisture requirements often create the perfect breeding ground for these pests.
While typically seen as small dark insects on stems, some aphid species can be mistaken for tiny flies when swarming. They suck sap from the celery petioles, leading to stunted growth and leaf distortion.
If there is decomposing organic matter in the celery pot, fruit flies may be attracted to the fermenting sugars. While not directly attacking the plant, their presence indicates a high moisture/decay environment detrimental to celery roots.
Your plant might also be experiencing one of these issues:
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