Not only are fungus gnats a nuisance by buzzing around you while watering flowers, they can also harm your houseplants. In the event of an infestation, you should therefore not wait too long, but fight the insects at an early stage. The eggs of the insects are often brought in with the potting soil, a moist potting soil then favors the rapid growth of the fungus gnat population. There are many methods to get rid of fungus gnats, we present the most gentle and promising ones. Of course, there are also chemical agents that help. However, you should avoid these if possible.
If you follow the tips below, fungus gnats should no longer be a problem.
Quartz sand and yellow sticker
In order to combat the fungus gnats, you should stop watering the plant for the time being, provided the plant can tolerate it. Then you should cover the potting soil with quartz sand () to prevent fungus gnats from laying eggs. Yellow stickers can help: These yellow stickers (also called yellow boards or yellow plugs, ) are simply stuck into the ground and, similar to fly traps, have an adhesive side to which the fungus gnats stick. These stickers also help with aphids.
There is also a very effective method using nematodes (): These are beneficial insects, more precisely very small nematodes that feed on the eggs, but leave the plant itself unharmed.
If you do not want to use nematodes, you can also use neem products (). As the name suggests, these products contain an extract from the neem tree, which is known to be effective in protecting against pests and diseases. However, these funds should only be used for ornamental plants.