How do you recognize the infestation?
It is possible that the damage caused by the fungus gnat is not immediately recognized. This is because the larvae are active in the soil. They particularly like the stems and roots of seedlings, young plants and cuttings. This damage to the plant prevents nutrient uptake and further weakens it. Damaged roots are also more susceptible to bacteria and fungi. Withering and stunted growth of the plant are common symptoms of a fungus gnat infestation.
How can (further) damage be prevented?
Removing dead plant debris can prevent further damage to the plant. Also, be careful not to overwater the plant. Fungus gnats prefer to lay their eggs in moist soil. Another tip is to cover the bottom of the plant with a layer of sand. Fungus gnats cannot penetrate this layer and therefore cannot lay eggs in the soil. If the larvae are in the ground, they can best be combated biologically with roundworms, a natural enemy of the fungus gnat. This parasite kills any larvae that cross its path.
The animal
Fungus gnats are small, dark gnats with long antennae and legs. They are between 3 and 5 millimeters long. They prefer to stay in a warm and humid environment, near plants. In greenhouses, they can also occur all year round. After mating, the females lay between 50 and 200 eggs, which hatch within two to three days.
