Fungus Gnats

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Fungus gnats are small insects (1/8 to 1/10 inch long) that are common in high-organic-matter houseplant soils that are kept moist. Though adults are mosquito-like in appearance, they do not bother humans or pets. It is actually the larvae or maggots that can injure plants by feeding on the roots. Symptoms include sudden wilting, loss of vigor, poor growth and yellowing leaves. Use of sterile media and avoiding over watering can help prevent infestations. Existing infestations can be controlled Bacillus thuringiensis v. israelensis (Gnatrol). (Ward Upham)

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