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Fungus Gnats

Class: Insect
Other names: Darkwinged fungus gnat
Color: Light brown to black
Size: 1/16 – ⅛ inch long
Wings: Light grey to clear; one common species has a dark Y shape on its wings
Diet: Fungi and decaying plant matter
Interesting Fact: Fungus gnat larvae can leave slug-like shiny trails on the surface of the soil.
Fungus Gnats: Are Your Houseplants Harboring These Tiny Pests?

Knowing when to water your houseplants can be a tricky business, but fungus gnats are one reason to err on the side of letting them dry out a bit before re-watering. The preferred habitat of these pesky creatures is soils and potting mix, and they thrive when those mediums are damp.

Fungus gnats may remind you of mosquitoes, but unlike the blood-sucking nuisances they don’t bite people. However, in their larval stage, they can eat the roots of plants and they’re especially damaging to seedlings.

Fungus gnats:

Are very small, less than ⅛ inch long
Have antennae and long legs
Are light brown to black in color
Feed on fungus, algae and decaying organic matter
Are sometimes confused with fruit flies

You may discover that you have a fungus gnat problem when you see small insects flying around your houseplants. You may also see them at windows or other light sources, since they’re attracted to light. They aren’t very strong flyers, however, and so stay close to their breeding areas (the soil).
Drive out fungus gnats by keeping things dry.

Female fungus gnats lay their eggs (up to 200 during their lifetime) in the top few inches of the potting medium or soil. When they hatch, the larvae resemble small, translucent worms with black heads. It takes the insects about two weeks to go from the larval to adult stage.

To prevent fungus gnats from making a home in your houseplants’ soil:

Avoid overwatering plants
Allow the first inch or two of the soil in your potted plants to dry out before you water it again (the larvae can’t survive in the dry soil)
Improve the drainage in your potted plants so that water doesn’t pool at the top
Buy pasteurized potting mix, which has been treated to remove the larvae
Use a specially-designated insecticide to kill the larvae
Trap adults using sticky traps placed in the soil or close by the plants

Be especially careful if you take your indoor plants outdoors during the summer and bring them in again in the fall. Your plants may become infested with fungus gnats when they’re enjoying their time outside.

Even tiny pests can be a big nuisance in your home. Call Brody Brothers today for help in removing them

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