How do Fungus Gnats affect the Hydroponic Garden?
A fungus gnat lays around 200 eggs at a time. After the eggs get hatched, they start eating your plant roots. This not only damages the root system, but also leaves the plant open to viruses and pathogens. If this is left unchecked, they multiply quickly and occupy your garden.
A plant which is being affected by fungus gnats, which show you the signs of nutrient deficiencies as the root system will be damaged.