We plant lovers don’t want to witness plants being harmed by pests. The problem enters our homes, which is gross, therefore we especially don’t want to see pests in our houseplants! Fungus gnats are pesky, winged insects with little wings that resemble mosquitoes and are about the size of fruit flies. The good news is that compared to many other pests, these plant flies cause significantly less harm, and even better, they’re rather simple to get rid of.
Long legs, transparent wings, and a preference for nutrient-rich, damp soils are characteristics of fungus gnats. These little flies may be seen flying around plant containers, but unlike some more dangerous pests, you won’t observe them actually chewing on the plant’s foliage. However, you will see them in the soil, feeding on the organic matter and hairs from plant roots. Do not underestimate the damage that these bugs can still do if not addressed.
Even though adult fungus gnats only live for about a week, they can have a big impact in that short time by producing up to 300 eggs under the correct circumstances. With such a quick turnaround and a brief life cycle of about 3–4 weeks, populations can grow incredibly quickly.
It’s rather simple to tell if your plant has a fungus gnat issue. Since these plant flies can’t fly very well, they usually stay rather near to the plant. They’ll probably be moving in zigzag patterns while you watch them. It’s typical to witness all the different phases of this bug at once because they reproduce so quickly. It’s likely that some bugs still in their larval stage will be visible if you gently agitate the soil. They inhabit the earth where they eat organic debris and have translucent bodies and glossy, black heads.
Our plants are getting ready to settle in for the upcoming cold season as winter approaches here in North Dakota. Unfortunately, that signals that these pesky bug populations are about to reach their peak. During this time, dormant plants use less water, which causes their soil to stay moist for longer. Gnats thrive in moist soils because they promote root rot and fungus. Be cautious when bringing delicate plants inside to overwinter since you run the risk of inviting unwelcome pests into your house.
Your plants will start to exhibit signs of stress if ignored and neglected. Fungus gnats don’t directly harm plant leaves, but they eat the root hairs and deplete the soil of vital minerals. This may result in abrupt plant withering and yellowing of the leaves, sluggish development, and a general decline in vigour.
When tackling any pest, you should always start with natural management approaches. The least hazardous and disruptive to your plant and house are typically natural and organic remedies, while chemicals may occasionally be required as a second line of defence. Fortunately, most fungus gnat populations may be controlled and eliminated naturally provided they are discovered and dealt with in a timely manner. Remember that one plant container can hold three to four generations of bugs, so you’ll probably need to apply your favourite approach more than once. Gnats in your indoor plants can be managed in the following ways:
Do not overwater. Before watering your indoor plants, allow the top couple of inches of soil to dry up. This will not only stop fungus gnats from deciding that your plant would make the best place for them to live, but it will also interfere with their reproductive cycle and assist to reduce populations that have already moved in.
Activate sticky traps. Not just for mice, either! Sticky traps are easy fixes for many pest issues. Gnats that are moving will be caught if you place them immediately on the soil’s surface. To stop them from laying eggs, remove them from the trap, discard them, and replace it frequently (every two to three days). Particularly effective at drawing these insects, yellow traps are.
Create vinegar and cider traps.
Mix equal volumes of cider and vinegar in a shallow dish or can to act as a trap for fruit flies. Lay the trap on the soil surface inside the container or even next to the damaged plant. The concoction will attract the bugs, who will then fall into it and drown.
Bring in useful nematodes. Although it may seem counterproductive to introduce additional bugs into the equation, doing so is a simple way to reduce pest numbers. Nematodes are incredibly minute, worm-like insects that are frequently invisible to the unaided eye. In their larval stage, they attempt to infiltrate fungus gnats and other insects, releasing a bacteria that eventually consumes the pest from the inside out. When you think about it, it’s awful and disgusting, but not as disgusting as allowing gnats to devour your prized houseplants!
If all else fails, there are always insecticidal goods and sprays to keep pest numbers under control. There are many products available that either target the adult stage or the larval stage, but either is OK. You should be able to get rid of these unpleasant plant flies in a few of weeks as long as you successfully target one phase of their life cycle and reapply often.
Larvae are easily eliminated with hydrogen peroxide since it kills them immediately upon contact. Infuse your soil with a solution made of four parts water and one part hydrogen peroxide.
To destroy larvae, neem oil can also be put to the soil after being diluted with water. Neem oil can also be sprayed on surfaces to instantly kill adult flies. Last but not least, pyrethrin sprays contain extracts that are harmful to a variety of pests and can instantly kill flies and fungus gnat larvae.
Fungus gnats can affect the health of your houseplants even though they don’t transmit any diseases that are dangerous to humans. Your plants will thank you by giving off a lush, healthy appearance to enliven your home if you keep pests at away.
How can fungus gnats in houseplants be eliminated?
The small black bugs that you see swarming around your indoor plants are called fungus gnats. Fungus gnats are not enjoyable at all, and getting rid of them from indoor plants can be difficult. Fortunately, I can provide you some excellent advice to help you permanently get rid of these pesky little critters.
How to eliminate fungus gnats from indoor plants: There are six ways to get rid of fungus gnats in houseplants:
- Use a solution of water and hydrogen peroxide.
- Observe the drying of the potting soil.
- Plant repotting or replacement of the growth media
- Yellow sticky cards can be used to lure and capture fungus gnats.
- Pesticides should be added to the potting soil.
- Utilize a biological pesticide
Fungus gnats are generally innocuous as adults, but the larvae can injure property. The majority of the time, larvae consume algae and fungi, but they can also consume soil-dwelling plant roots, which can result in root injury and reduced growth. Fungus gnats should ideally be exterminated as soon as you see them. Continue reading to discover how to successfully eradicate fungus gnats from indoor plants and how to avoid repeat infestation.
How can fungus gnats be eliminated without endangering indoor plants?
Size: Fungus gnat adults are very little. They are around the same size as a fruit fly, measuring between 1.5 to 3 mm, or 1/16 to 1/8 of an inch. Larvae of fungus gnats can grow to a length of 1/8 of an inch.
Fungus gnats have wings that are either grey or transparent and are an adult grayish-black colour. Despite being much, much smaller in size, they have the appearance of mosquitoes due to their lengthy legs and antennas. Fungus gnats are smaller than fruit flies and have larger legs and antennae.
Activity: Fungus gnats often spend the most of their time buzzing about the outside of potted plants’ soil surfaces or close to their drainage holes. They have a propensity to wander along the ground and only soar briefly because they are not good flyers. They fly more like mosquitoes than fruit flies due to their irregular flight and sluggish speed.
Fungus gnats are absolutely harmless, but annoyingly, they frequently fly into people’s faces and beverages. A few well-placed swats will quickly teach them a lesson.
Fungus Gnat Damage
Fungus gnats are more of a nuisance when they are few in number. In actuality, neither plants nor people are actively harmed by adult gnats. However, if their population becomes out of control, the larvae may begin eating plant roots and cause significant harm. This is particularly harmful to young plants like seedlings because they have few, sensitive roots. The plant disease that causes damping down and the eventual death of seedlings can also be carried by fungus gnats.
Damage from fungus gnats will resemble any other root-related problem, such as root rot. Lower leaves may drop and turn yellow, and the plant’s growth may slacken or cease entirely. In really terrible situations, the entire plant may begin to wilt, and if the roots are severely harmed, the plant may then pass away.
How to Get Rid of Fungus Gnats
The key to controlling fungus gnats is to be consistent. The adults are pretty simple to catch in gnat traps, but since the adult population arrives in cycles, you must make sure that your traps are refilled frequently. Use a mix of the traps indicated here and the additional preventative measures listed in the next section for the best results.
Traps with sticky cards: These traps feature a yellow note card that is adhered with a sticky substance. They work best when they are either fastened to skewers just above the soil or chopped into little squares and positioned directly on top of the soil. On the card, adult gnats will fly or crawl and become stuck in the glue. Use yellow sticky cards instead of blue ones since fungus gnats are drawn to that colour. Both can be purchased online as well as at the majority of hardware or garden stores.
Simple and efficient, cider-vinegar traps are made of a shallow container filled with water, liquid dish detergent, and a little bit of apple cider vinegar.
- Making a vinegar-and-cider trap Look for a shallow container. Use a tuna can and fill it halfway with apple cider vinegar and water. (The liquid must be at least one-fourth of an inch deep.) Then, gently stir in a few drops of liquid dish soap to the mixture. Placing the trap inside the container on top of the soil or, ideally, close to the damaged plant’s base will work best. Every few days, check it and replenish with fresh vinegar and water.
Flypaper can also be used to catch fungus gnats. Flypaper ribbons are commonly used to catch outdoor flies in horse barns. However, these traps are frequently overkill for gnats and easily stick to items like furniture, hair, plants, and other surfaces that you don’t want them to.
How to Prevent Fungus Gnats
For best success, combine these preventative measures with the aforementioned traps.
Maintain dry soil: Fungus gnats prefer damp soil, so letting your houseplants air out a little between waterings will help to slow down or halt an infestation. Prior to watering again, wait until the top inch or two of soil have dried up. Also, attempt to let as much time pass without watering. If the dirt is dry on the surface, gnats may not lay their eggs.
Use mosquito dunks (containing helpful bacteria) to prevent mosquito larvae from overcrowding fish ponds, fountains, and other small bodies of water. A dry pellet containing the microorganisms Bacillus thuringiensis subspecies isrealensis makes up the product. The larvae of flying insects, such as mosquitoes, fruit flies, and fungus gnats, are infected by and killed by this advantageous bacteria.
- How to apply mosquito dunks Add a mosquito dip to a gallon jug (or watering can) after filling it with clean water. Before dropping the dunk into the water, it’s a good idea to break it up a bit. Alternatively, you can wait for it to soften before doing so. The dunk should be submerged in the water for as long as possible (at least overnight), after which it should be removed (the dunk can be reused) and the water utilised for plants with fungus gnat infestations. Any larvae that come into touch with the bacteria in the soil will be infected and killed because the infection has already gotten into the water. For at least a few months, repeat this procedure each time you water your plants.
Cover drainage holes: Gnats frequently stay near the tops of pots, but occasionally they will make their way to the drainage holes on the underside and begin laying eggs there as well. If this occurs, cover the drainage holes with a piece of synthetic fabric to keep gnats away while still allowing water to flow freely through. Use tape or rubber bands to secure.
Sand-cover exposed soil: According to some people, fungus gnats can’t reach exposed soil to deposit their eggs if it is covered with a layer of sand that is at least 3/4 inches deep. If combined with the other preventative techniques mentioned above, notably plugging drainage holes, this can be a powerful deterrent.
Do you have any advice for halting or preventing infestations of fungus gnats? Tell us in the remarks section below!
I have potted plants, how can I get rid of the gnats?
Fortunately, there are several of organic and chemical-free ways to get rid of fungus gnats from your prized plants. You can use a traditional trap or common household goods like potatoes and dish soap!
Let the Soil Dry
It’s important to remember to let the soil dry out for a few days and refrain from watering your plant because fungus gnats and their larvae prefer to nest in moist soil. The gnats will be forced to live in an uninhabitable habitat as a result, and they will disappear in dry soil. Do not be afraid to skip your next watering in order to get rid of the gnats; your houseplant will be able to endure the dryness for a longer period of time than you might imagine.
The best advice is to take your plant out of the planter and drain any extra water from the bottom. Thus, there won’t be any dampness where gnats might deposit their eggs.
Use Traps
There are numerous traps you may employ to get rid of these bothersome bugs if you’re seeking for a speedier fix. You can choose to DIY these with a few common things or run to the store and buy specialist traps, depending on what best suits your needs.
- Pour a cup of white vinegar and a few drops of liquid dish soap onto a shallow saucer. The gnats will be drawn to the solution and fall into the trap if you place the bowl near your plant. Repeat the procedure until no more gnats are present.
- Sticky fly traps are an alternative if the smell of vinegar deters you from making your own homemade gnat trap. These little yellow paper sheets attract gnats and trap them with glue because of their brilliant hue. Although it might not be visually appealing, this procedure is simple and safe.
- Consider purchasing an indoor fly-catching gadget if you’re sick and tired of gnats in your plants and need an urgent fix. These are typically USB-powered and can be purchased locally or online. The fans and LED lights draw the gnats, and eventually they are drawn into the trap.
- Are there any extra potatoes in the kitchen? Set a trap for them! Place the potatoes flesh-down on the ground after cutting them into little pieces. The fungus gnats will be drawn to the potatoes by their dampness. Just be careful that the parts don’t dry out otherwise it won’t operate.
Sanitize and Repot
Consider removing the plant from its planter and scraping out the soil if you want to take matters into your own hands. When doing this, take care not to disrupt the roots and take only what you can get rid of. Put the contaminated soil in a plastic bag and wash the planter with soap and warm water to sterilise it. Repot your plant into new soil after this is finished, then put it back into its planter.
Use a Spray Bottle
Take a spray bottle and combine water and dish soap in it. Repeat the technique until all of the gnats are gone by spraying the solution on the top layer of soil. If you’re seeking for a quick and natural solution to get rid of fungus gnats, try this.