Reddy Kilowatt said:
here you go how much proof do you want? All it takes is a little reading to learn about the critters living in your soil, you obviosly havnt done any reading on the subject but yet your saying Im wrong about a subject you obviously know nothing about
Fungus gnats are those little hopping bugs you see when you water your indoor plants. They are 1/32 to 1/50 inches with black or gray bodies and clear wings. Plants grown under cover are most susceptible. The larvae feed on dead roots and leaves, but sometimes consume tender new roots.
taken from hxxp://www.ehow.com/how_9360_control-fungus-gnats.html
Adult fungus gnats are mostly an annoyance, but the larva can do damage to young plants and seedlings by feeding on the new, tender roots. It is also thought that they feed on the developing callus of cuttings, delaying the development of new roots.
Their feeding stresses the plants and provides an entryway for disease pathogens. The first symptom of damage is usually wilting, followed by general decline of the plant.
taken from hxxp://gardening.about.com/od/gardenproblems/a/FungusGnats.htm
The term, fungus gnat, applies to a number of species in the insect order Diptera, family Sciaridae (dark winged fungus gnat species Bradysia coprophila, impatiens and paupera). Fungus gnat adults are a nuisance to greenhouse operators, interiorscapers as well as consumers. The larval stages can damage healthy roots, stunting or killing young plants even where there is no fungal food source (Lindquist 1994). Prolonged infestations may cause stunted, off-colored plants or foliage (Cole 1985). Damage may actually be more severe to young plants when the potting media or soil has been sterilized. Fungus gnat larvae may also aid in the introduction and spread of plant diseases such as Pythium, Verticillium, Cylindrocladium, Scelerotinia and Theila-viopsis.
taken from hxxp://insects.tamu.edu/extension/bulletins/uc/uc-028.html
How much more proof do you want?