Why does your Allium fistulosum have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely adults of the fungus gnat species, which lay eggs in moist organic matter. Their larvae feed on the fine root hairs of Allium fistulosum, potentially leading to stunted growth or yellowing leaves.
Excessive moisture in the Allium fistulosum pot or garden bed creates the perfect breeding ground for fungus gnats. Constant wetness also reduces oxygen availability to the onion roots, making them more susceptible to rot.
If you have recently added compost or fresh organic mulch around the base of your green onions, this provides a nutrient-rich environment for fly larvae to thrive. The decaying material attracts adult flies looking to oviposit.
Your plant might also be experiencing one of these issues:
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