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! The little winged creatures known as fungus gnats are about the size of fruit flies and resemble tiny mosquitoes (don’t worry, they don’t sting!). The good news is that these pests are considerably less dangerous than many others, and even better, they are rather simple to get rid of.
What are Fungus Gnats?
It’s probably a fungus gnat if you encounter a little winged bug that resembles a fruit fly fluttering about the soil of your houseplant. They are attracted to damp, nutrient-rich soils and have long legs for a fly their size. Your plants’ leaves have very little appeal to fungus gnats; instead, they prefer the damp earth beneath the plant canopy. They devour the hair roots of your plants and lay their eggs in the top layer of damp soil. Nothing is more impolite than an unwelcome guest laying eggs in your favorite plant and consuming its roots, even though their damage may be modest. These bugs eventually cause wilting, poor growth, and discolored leaves if left untreated.
Signs of Fungus Gnats
If you have a gnat infestation, you already know how noticeable they are. Due to their poor flight abilities, these flies usually stay rather near to the plant. They’ll be moving in zigzag patterns as you watch. Their tiny, transparent larvae could be visible if the dirt is carefully stirred. Yellow sticky cards are an excellent control method as well as a terrific way to keep track of their activity. See more below on that.
The Number One Way to Get Rid of Gnats
Infestations of fungus gnats typically occur when the soil is very damp. Problems might arise when plant parents provide the same care to their plants throughout the year. Consider this: Compared to the winter, our homes are typically brighter and more humid in the summer. In the winter, most plants become more dormant as a result of the changing seasons. You can keep fungus gnats from setting up camp in your plant pots by reducing the amount of water you use.
Gnats deposit their eggs in the top layer of the soil, and the soil must remain moist for the eggs to survive. It can harm the eggs and disrupt the gnats’ life cycle if you let it dry out. Your indoor plants should be soaked from below if your pot allows it. While the soil near the root ball absorbs water, the soil surface remains dry. Place the pot in a dish of water and let the water to seep up through the drainage holes to do this.
What If That Doesn’t Work?
You can intensify your treatment plan if you’ve modified your watering schedule and the gnats are still present or if you want to get rid of them quickly. Here are a few simple methods for getting rid of gnats in your indoor plants:
Apply sticky cards. In our greenhouse, you may have noticed the yellow cards on sticks and wondered what they were for. The cards are positioned directly above the soil’s surface since gnats prefer the color yellow. Checking what you’ve captured allows you to keep track of what you have while also getting rid of all the gnats that land on your credit card. Replace your sticky card every 4-6 weeks (or sooner if it’s bugged), just to be safe.
Larvae are quickly, inexpensively, and efficiently killed upon contact with hydrogen peroxide solution. Spray your soil with a solution made of four parts water to one part hydrogen peroxide.
Although unpleasant, fungus gnats can’t stand a chance against a plant parent with a game plan. To avoid these disgusting bugs, reduce your watering frequency throughout the winter and develop the habit of bottom-watering. You won’t regret it!
How can you get rid of tiny flies in the soil of indoor plants?
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 vigor.
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 defense. 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 favorite 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.
Why do my potting soil have tiny insects in it?
In comparison to a fungus gnat, the shore fly (right) has a more substantial body and shorter antennae (left).
Small flies called fungus gnats are pests that attack soil, potting soil, other container materials, and other sources of organic decay. Their larvae devour roots and can be a concern in greenhouses, nurseries, potted plants, and interior plantscapes. Their larvae mostly consume fungi and organic debris in soil. Indoor houseplants may produce adult fungus gnats, which can be a nuisance.
IDENTIFICATION
The Orfelia and Bradysia species of fungus gnats, often known as darkwinged fungus gnats (Sciaridae), are small, delicate-looking insects that resemble mosquitoes in appearance. Fungus gnats have segmented antennae that are longer than their heads and thin legs. They can be distinguished by their lengthy antennae from shore flies with shorter, bristle-like antennae that are more hardy, also seen in greenhouses, and linked with algae and decaying organic debris. Fungus gnat adults typically measure between 116 to 18 inches in length, while some species can grow up to 12 inches in length. The common Bradysia species have Y-shaped wing veins and light gray to transparent wings.
Adult fungus gnats are drawn to light, so you may initially see them flying close to windows indoors. However, fungus gnats are rather poor flyers and typically don’t move around much indoors in contrast to more active species like the common housefly (Musca domestica). Fungus gnats frequently hang around potted plants and fly across growing medium, foliage, compost, and wet mulch piles (or rest there).
In potting soil or damp organic waste, females lay their small eggs. Larvae have an elongated, whitish-to-clear body and a shiny, black head. They consume compost, root hairs, fungi, leaf mold, grass clippings, and organic mulch. If the environment is particularly damp and there are lots of fungus gnats, larvae may produce slime trails on the surface of the medium that resemble those of little snails or slugs.
DAMAGE
Adult fungus gnats don’t bite people or harm plants; instead, their presence is primarily seen as an annoyance. However, a huge population of larvae can harm the roots of a plant and impede its growth, especially in seedlings and young plants. In interior plantscapes and with houseplants, significant root damage and even plant mortality have been noted when high populations were linked to damp, organically rich soil. Therefore, a wilting houseplant may not be a sign of a water shortage but rather root damage from fungus gnat larvae or (more frequently) from other causes of unhealthy roots. The more typical causes of wilting plants, however, include excessive or insufficient water, root decay fungus, and unfavorable soil conditions (such as inadequate drainage or waterlogging).
Greenhouses, nurseries, and sod farms are more frequently affected by severe fungus gnat damage. Although larvae also consume plant roots outside, they typically don’t cause much harm.
LIFE CYCLE
Egg, larva (with four larval stages or instars), pupa, and adult are the four phases through which fungus gnats develop. In moist organic medium, where females lay eggs and larvae feed, the small eggs and oblong pupae are found. Eggs hatch around 75oF in about 3 days, larvae take about 10 days to transform into pupae, and adults appear in about 4 days. Depending on the temperature, a generation of fungus gnats (from female to female) can be produced in around 17 days. They will grow more quickly and produce more generations per year as the temperature rises.
Each year, there are numerous overlapping generations of fungus gnats. In California’s interior, they are most prevalent outside in the winter and spring months when water is more readily available and the weather is colder. In damp coastal areas and indoors, they can occur at any time of the year.