Fungus gnats are tiny mosquito-like insects, about 1/8 inch in length. You will generally first notice them darting about new seedlings. 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.
Fungus gnat eggs are laid in cracks on the soil surface. They hatch into larva within 6 days and begin feeding on plant roots. After feeding for about 2 weeks, they pupate in the soil and emerge in less than a week as adults, to begin the cycle all over again. Fungus gnats are one of those insects that give birth to mostly females, helping the population to increase rapidly. One female can lay between 100-300 eggs.
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