Gnats - Knowledgebase Question

San Bernardino, CA
Question by lonbev
March 9, 2001
I have a baby Orange tree I keep in the house most of the time, and a Passon flower. Well I have gnats all over living in the soil. Please tell me how to kill them without hurting the plant. Thanks.

Answer from NGA
March 9, 2001


It sounds like you could have an infestation of fungus gnats, which lay eggs in the soil. In small numbers, the insect is merely a nuisance. The larvae, however, devour young roots, and a severe infestation can harm plants.

Any house plant pests can be brought into your home on new plants. They can also come inside with your plants after a summer in the garden. Fungus gnat seem to come out of nowhere, and appear on houseplants and seedlings.

One control is called Knock-Out Gnats (available from Gardens Alive, ph# 812-537-8650, address 5100 Schenley Pl., Lawrenceburg, IN 47025); this product contains a strain of Bt, a biological control, that controls the larvae.

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