Why does your Tomato Yellow TI 169 F1 have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnats, whose larvae live in moist organic matter and feed on fine root hairs of the tomato plant. This can lead to nutrient deficiencies and stunted growth in your cherry tomato seedlings.
While usually associated with decaying matter, these flies are attracted to the fermenting sugars in overripe or damaged cherry tomatoes. They do not attack healthy tissue but thrive in the microclimate created by tomato plant debris.
The flies seen may actually be adult leafminer flies that have recently emerged to lay eggs. Their larvae create distinctive winding, white 'mines' inside the tomato leaves.
Your plant might also be experiencing one of these issues:
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