Why does your Allium cepa Vuelta 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 moist organic matter surrounding the onion bulbs, feeding on decaying roots and fine root hairs. Their presence often indicates that the soil substrate is excessively moist, which can lead to bulb rot in Allium cepa.
While the adults are flies, the damage is caused by larvae tunneling into the onion scales. This pest specifically targets the succulent tissue of Allium species, causing rapid degradation of the bulb structure.
If the onion bulbs are beginning to ferment or decay due to moisture, these flies are attracted to the smell of decomposing organic matter. They do not attack healthy Allium tissue but act as indicators of underlying rot.
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