Why does your Brassica rapa 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 soil of Brassica crops, feeding on organic matter and fine root hairs. This can lead to stunted growth or yellowing in young Pak Choi seedlings due to root damage.
While typically attracted to decaying matter, these flies can be drawn to overripe or fermenting organic mulch around the base of your turnips. They do not directly attack the Brassica tissue but indicate a high moisture/decay environment.
While not 'flies' in the flying sense, the adult flies lay eggs in the leaves, and the resulting larvae create serpentine tunnels. The presence of small flies often correlates with the emergence of these micro-lepidoptera or diptera pests.
Your plant might also be experiencing one of these issues:
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