Why does your Onion Yellow Stone F1 have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The larvae of these flies live in the soil and feed on organic matter or fine root hairs, which can weaken the onion bulbs. The adults emerge to lay eggs in the moist topsoil near the base of your Yellow Stone onions.
While often characterized by larvae, adult flies lay eggs at the base of the onion scales. If these eggs hatch, the maggots tunnel into the fleshy layers of the Yellow Stone bulb, causing rot and decay.
If there is decomposing organic matter or over-fermenting mulch around the onion base, these flies may be attracted to the area. While they don't feed on the onions directly, their presence indicates an environment prone to rot.
Your plant might also be experiencing one of these issues:
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