Fungus gnats, which look like fruit flies or small mosquitos, are gnats that create larvae in the soil that can feed on soil and even roots. The larvae become adult fungus gnats, and the cycle continues. Find out how to stop the cycle of fungus gnat production and get rid of fungus gnats in your indoor garden. The ways shown in this video are all natural.
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Welcome to Healthy Houseplants, where we teach you all about gardening in the great indoors. Today’s video is sponsored by our Amazon affiliate link, which you’ll find in the description below. You’ll also find links to any videos that I mention during this presentation.
Today, I’m going to talk to you about fungus gnats and your houseplants—what they are and how to control them.
Fungus gnats are those little irritating flies that resemble small mosquitoes; they look a lot like fruit flies, but they aren’t. They tend to fly in front of your face and can be very annoying for anyone visiting you. The adult gnats lay eggs in the top inch of your soil, and the larvae feed on decaying matter, which is common in organic soil and compost. When the infestation is severe, the gnats can damage plant roots, but this usually requires a very high population. Typically, they are more annoying than damaging.
Fortunately, there are several ways to control fungus gnats. One option is to introduce fungus gnat mites (Hypoaspis). These mites are naturally found in soil and can be obtained from insectaries. The female mites lay eggs, and their larvae will feed on the fungus gnat larvae, effectively reducing their numbers.
Another method is to use predatory nematodes. There are two species of Steinernema nematodes that target fungus gnat larvae. These microscopic worms invade the larvae’s bodies, releasing a toxin that kills them quickly.
If you already have fungus gnats, here are some tips to regain control. For example, I had an infestation in my indoor Alpine strawberries. They’re often vulnerable due to the decomposing matter in organic soil. I used yellow sticky traps, which catch flying pests, including fungus gnats.
Additionally, mosquito bits, which contain Bacillus thuringiensis, can be sprinkled on the soil or added to hydroponic systems to kill larvae. Lastly, let the top inch to inch and a half of soil dry out between waterings. Many houseplants thrive on this drying period, which also deprives larvae of moisture necessary for their growth.
Be mindful to check the drainage trays beneath pots; standing water can also contribute to fungus gnat reproduction.
By employing these methods, you can regain control over fungus gnats and keep your indoor plants healthy. Thank you for stopping by today! Please leave any comments about indoor gardening tutorials you’d like to see. Remember to like, comment, subscribe, and share this video.
Fungus Gnats and Houseplants FAQ
What are fungus gnats?
Fungus gnats are small flies that resemble mosquitoes or fruit flies. They are common pests in houseplants that can be quite annoying as they fly around, particularly when watering plants.
How do fungus gnats harm houseplants?
While typically more annoying than damaging, a severe infestation can lead to gnats feeding on plant roots, which can ultimately harm or destroy the plant.
What are effective ways to control fungus gnats?
Control methods include introducing fungus gnat mites and predatory nematodes, using yellow sticky traps, applying mosquito bits with Bacillus thuringiensis, and allowing the top inch of soil to dry out between waterings.
Can I use yellow sticky traps for fungus gnats?
Yes, yellow sticky traps are effective in catching flying pests, including fungus gnats. They help reduce the adult population.
What should I do about standing water in pot drainage trays?
Standing water in drainage trays can promote fungus gnat reproduction. Ensure that these trays are emptied regularly to prevent infestations.
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