Fungus gnats (Bradysia sp. Sciaridae) are a common problem in greenhouse crops, as they like high levels of organic matter and moisture.
Adult fungus gnats can be found sitting on the surface of plastics and media, and flying around the bottom of plants.
They are small (5 mm) black flies with long legs and antennae, with a single pair of wings. Under a microscope, a Y-shaped pattern can be seen in the veins on the end of the wings.
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