Eliminating Fungus Gnats on Meyer Lemon Without Pesticides

Where Fungus Gnats Come From

Those tiny, clumsy black flies hovering around your Meyer lemon almost certainly hitched a ride in the potting soil. Fungus gnats thrive in damp, humus-rich mixes.

Prevention Is Key

• Don’t overwater. Soggy soil is an open invitation.
• Inspect before you buy. If you see gnats around a plant at the nursery, walk away.

Monitoring and Non-Chemical Control

• Yellow sticky cards placed horizontally on the soil surface trap adults.
• Potato traps: Lay 1-inch potato cubes on the soil; after a few days, lift them to check for—and remove—larvae.

Let the soil dry nearly completely between waterings to break the life cycle. Persistence with these methods usually clears the infestation without harming your tree.