Why does your Lactuca sativa have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe tiny black flies are likely adult fungus gnats, whose larvae live in the soil and feed on organic matter and fine root hairs of the lettuce. High moisture levels in the growing medium attract these pests, which can lead to secondary root damage.
These flies are highly attracted to the damp, decaying organic matter often found in lettuce potting mixes. While adults are a nuisance, their presence indicates an environment prone to fungal growth which can affect lettuce health.
Certain species of small flies lay eggs on or inside the leaves; once hatched, the larvae tunnel through the lettuce parenchyma, creating characteristic serpentine blotches. This can cause the lettuce leaves to wilt or become unmarketable.
Your plant might also be experiencing one of these issues:
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