When dealing with the pesky fungus gnats, finding the best insecticide can be crucial for maintaining a healthy garden, houseplants, or crops. These tiny pests not only disturb the aesthetic of your plants but can also lead to root damage and stunted growth.
Fungus gnats thrive in moist, humid environments and are often found in potting soils and hydroponic systems. To eradicate them effectively, choosing the right insecticide is key.
In this article, we’ll provide you with detailed reviews of the 20 best insecticides for fungus gnats, highlighting their features, benefits, and drawbacks to help you make an informed decision.
On This Page Expect To Learn
Tips for Choosing the Best Insecticide for Fungus Gnats:
- Targeted Action: Ensure the insecticide targets fungus gnats specifically to avoid harm to beneficial insects or plants.
- Ease of Application: Look for easy-to-use fungus gnats insecticide formulas like sprays, granules, or ready-to-use products.
- Active Ingredients: Check the active ingredients in the fungus gnats insecticide to ensure they are effective yet safe for your plants and environment.
- Duration of Effectiveness: Select an insecticide that offers lasting fungus gnats and protection to prevent re-infestations.
- Non-Toxic Options: Choose organic or non-toxic fungus gnats insecticide if you are growing edible plants or have pets.
20 Best Insecticides For Fungus Gnats
1. BioAdvanced Complete Insect Killer – Best Fungus Gnats Insecticide
BioAdvanced Complete Insect Killer is a proven solution for eliminating fungus gnats and other pests. With its dual-action formula, this insecticide not only kills adult gnats but also targets the larvae in the soil. The granular form ensures deep penetration into the soil, offering long-lasting protection against re-infestations.
The product is effective against multiple insect pests, making it versatile for different plant types. It contains imidacloprid, a systemic insecticide that works through plant roots to provide continuous protection. BioAdvanced Complete Insect Killer is also rain-resistant, ensuring its effectiveness even in humid conditions.
For plants that are prone to fungus gnat infestations, this product provides a reliable solution. It’s designed for both indoor and outdoor plants, making it a great choice for gardeners looking to protect their crops. With a high concentration of active ingredients, it works efficiently to disrupt the gnat lifecycle.
Pros:
- Long-lasting effect
- Easy to apply
- Rain-resistant
- Versatile use
- Works on larvae
- Targeted pest control
- Proven effectiveness
Cons:
- Toxic to bees
- Harsh chemicals
- Not organic
2. Safer Brand 51703 Fungus Gnat Trap – Organic Fungus Gnats Insecticide
Safer Brand 51703 Fungus Gnat Trap offers an organic solution for fungus gnat control. These yellow sticky traps attract and capture adult gnats, preventing them from laying eggs in the soil. The trap contains no harmful chemicals, making it a safe option for households with pets and children.
The sticky traps are designed to be used in conjunction with other treatment methods for optimal results. By removing adult gnats from your plants, they help break the gnat lifecycle and prevent further infestations. This product is especially useful for gardeners who prefer organic pest control methods.
With its non-toxic, eco-friendly design, Safer Brand Fungus Gnat Trap provides a hassle-free way to protect your plants. It’s ideal for use in both small indoor gardens and larger outdoor crops. Additionally, the traps are easy to set up and replace when full.
Pros:
- Non-toxic
- Eco-friendly
- Easy setup
- Safe for pets
- Chemical-free
- Prevents re-infestation
- Effective against adults
Cons:
- Only captures adults
- Not a complete solution
- Limited to small areas
3. Gnatrol Biological Insecticide – Best Fungus Gnat Insecticide for Soil
Gnatrol Biological Insecticide uses a natural bacterium called Bacillus thuringiensis (Bt), which targets fungus gnat larvae in the soil. It is an excellent choice for those looking for an environmentally safe method of controlling gnats. Gnatrol is safe for plants and pets, making it ideal for indoor and organic gardens.
This insecticide comes in a liquid form and can be diluted for easy application. Once applied to the soil, the bacteria work to infect the larvae, effectively stopping their development. Gnatrol has a targeted action that ensures it only affects the gnat larvae without harming other beneficial organisms.
Gnatrol is a great choice for gardeners looking for a biological insecticide. It’s effective, eco-friendly, and works well in both hydroponic and soil-based gardening systems. For those dealing with stubborn gnat infestations, Gnatrol offers a safe and reliable alternative to chemical treatments.
Pros:
- Eco-friendly
- Safe for pets
- Targets larvae
- Biologically active
- No chemical residue
- Effective in soil
- Long-lasting results
Cons:
- Slower action
- Requires multiple applications
- Expensive for large areas
4. Mosquito Bits – Best Fungus Gnat Larvae Killer
Mosquito Bits is a biological insecticide that works by releasing a naturally occurring bacterium Bacillus thuringiensis israelensis (Bti) into the soil. This bacterium targets fungus gnat larvae, disrupting their lifecycle and preventing further infestations. It’s especially effective in pots, garden soil, and hydroponic systems, making it a versatile solution.
The product comes in small granules that are easy to sprinkle around plants. Once applied, it works quickly and continues to protect the plants for weeks. Mosquito Bits is also safe for plants and pets, making it ideal for organic gardeners looking for a non-toxic pest control method.
As a fast-acting and effective biological control agent, Mosquito Bits helps eliminate gnat larvae and prevents their return. It’s a great choice for long-term protection, especially for sensitive indoor plants and edible crops.
Pros:
- Fast-acting
- Non-toxic
- Safe for pets
- Long-lasting protection
- Organic
- Easy to apply
- Effective against larvae
Cons:
- Only targets larvae
- Requires reapplication
- May not work on adults
5. Bonide Systemic Houseplant Insect Control – Best Fungus Gnats Insecticide for Houseplants
Bonide Systemic Houseplant Insect Control provides a convenient solution for controlling fungus gnats in potted plants. The insecticide is absorbed by the plant and distributed throughout, killing pests that feed on the plant, including fungus gnats. Its systemic nature makes it effective at reaching areas where traditional sprays might not.
The active ingredient, imidacloprid, is known for its ability to effectively target and kill various pests, including fungus gnats, at every stage of their lifecycle. It provides protection for up to 8 weeks, making it ideal for long-term pest control. Additionally, it’s easy to use—simply mix with water and apply to the soil.
Bonide Systemic Insect Control is a great choice for those who want an easy, effective, and long-lasting solution for fungus gnat control. It works well for indoor plants and can also be used for outdoor ornamental plants.
Pros:
- Systemic protection
- Long-lasting
- Easy application
- Effective against adults and larvae
- Fast-acting
- Targets multiple pests
- Ideal for houseplants
Cons:
- Toxic to beneficial insects
- Requires watering
- May not be organic
6. Greenlight Fruit Tree Spray – Best Fungus Gnat Insecticide for Fruit Plants
Greenlight Fruit Tree Spray is designed for fruit trees but works equally well on a variety of other plants. This insecticide is effective against fungus gnats, aphids, and other common garden pests. It uses the active ingredient permethrin to control adult gnats and their larvae in the soil.
The spray is versatile and can be used both indoors and outdoors. It kills on contact, making it a quick solution for an infestation. The product is particularly effective for fruit tree growers who may struggle with pests like fungus gnats that attack the roots and impede healthy growth.
Greenlight is ideal for treating fungus gnats in orchards and home gardens alike. It’s also a good choice for those looking for a more targeted approach to pest management on fruit-bearing plants.
Pros:
- Fast-acting
- Kills on contact
- Multi-pest control
- Versatile application
- Ideal for fruit plants
- Easy to use
- Effective in soil
Cons:
- Toxic to bees
- Requires careful application
- Not suitable for edible plants without washing
7. AzaMax Systemic Insecticide – Best Natural Fungus Gnat Insecticide
AzaMax is a natural, organic insecticide made from the neem tree’s seeds. It’s effective against a wide range of pests, including fungus gnats, and is safe for both plants and pets. This systemic insecticide works by disrupting the insect’s hormonal system, preventing them from feeding and reproducing.
AzaMax can be used as a soil drench to control fungus gnat larvae or as a foliar spray to kill adult gnats. It is known for its ability to provide long-lasting protection without harming the environment. Being derived from neem, it’s an eco-friendly alternative to chemical pesticides.
For gardeners seeking an organic, non-toxic solution, AzaMax is an excellent choice. It offers effective, long-term control without harming beneficial insects and pollinators.
Pros:
- Organic
- Eco-friendly
- Safe for pets
- Effective on larvae and adults
- Systemic protection
- Long-lasting
- Non-toxic
Cons:
- Requires multiple applications
- Slower to act
- Not effective on all pest species
8. The Organic Gardener’s Neem Oil – Best Fungus Gnat Insecticide for Organic Gardens
Neem oil is a widely recommended natural insecticide that works by interfering with the pest’s hormonal systems. It’s highly effective against fungus gnats, especially their larvae, and can be used both indoors and outdoors. The Organic Gardener’s Neem Oil is derived from the neem tree and is safe for organic gardens.
This insecticide works by suffocating the pests and disrupting their feeding and reproductive patterns. It’s ideal for gardeners looking for an eco-friendly solution to control fungus gnats in a sustainable manner. Additionally, neem oil has fungicidal properties, helping to prevent mold and mildew growth.
Neem oil is easy to apply, and its versatility makes it an excellent addition to any organic garden. It’s safe for use around beneficial insects when applied correctly.
Pros:
- Organic
- Eco-friendly
- Multi-purpose
- Safe for plants and pets
- Easy to apply
- Effective on larvae
- Prevents fungal growth
Cons:
- Strong odor
- Requires reapplication
- May harm some beneficial insects
9. Safer Brand 5110 End All – Best Fungus Gnats Insecticide for Sensitive Plants
Safer Brand 5110 End All is a plant-based insecticide made from pyrethrins, which are derived from chrysanthemum flowers. This insecticide is effective in controlling fungus gnats, aphids, and other common garden pests. It’s a great choice for those looking for a natural solution that’s safe for sensitive plants.
The product works by disrupting the nervous system of insects, quickly killing them on contact. It’s ideal for use on delicate plants, as it doesn’t harm the plant tissue or structure. As an organic insecticide, Safer Brand is a safe choice for households with pets or children.
End All is versatile, as it can be used both as a foliar spray and as a soil drench for fungus gnat larvae. This makes it a convenient all-in-one solution for pest control in both indoor and outdoor settings.
Pros:
- Organic
- Safe for sensitive plants
- Kills on contact
- Easy to apply
- Fast-acting
- Multi-pest control
- Non-toxic
Cons:
- Requires reapplication
- Toxic to some beneficial insects
- Not ideal for large infestations
10. Killzall Weed & Grass Killer – Best Fungus Gnats Insecticide for Outdoor Areas
Killzall Weed & Grass Killer is typically known for controlling weeds but also provides excellent pest control for fungus gnats. It works by attacking the pests directly and disrupting their feeding habits. This product is especially effective in outdoor garden areas and larger plantings.
The formula contains glyphosate, which is potent against many pests, including fungus gnats. It’s easy to use and provides long-lasting protection. For gardeners looking for an effective solution for both weeds and pests, Killzall offers dual-action benefits.
This insecticide is effective against fungus gnats and other pests, making it a versatile tool for maintaining healthy, pest-free plants. Its simplicity in application makes it an attractive option for larger gardens.
Pros:
- Multi-use (weed and pest control)
- Fast-acting
- Easy application
- Effective for large areas
- Long-lasting protection
- Affordable
- Proven results
Cons:
- Harmful to beneficial insects
- Toxic to plants
- Requires careful application
11. Gnatrol – Best Fungus Gnat Insecticide for Professional Gardens
Gnatrol is a biological insecticide containing Bacillus thuringiensis israelensis (Bti), a naturally occurring bacterium known for targeting and killing fungus gnat larvae. This product is a popular choice for professional gardeners and commercial growers because of its high effectiveness and long-lasting results. It is ideal for those dealing with heavy infestations in both indoor and outdoor gardens.
Once applied, Gnatrol releases Bti into the soil, which then attacks the fungus gnat larvae, disrupting their ability to feed and reproduce. The product is also non-toxic to plants, animals, and beneficial insects, making it an excellent choice for eco-conscious gardeners. Gnatrol is available in both liquid and granular formulations for easier application depending on your gardening needs.
It’s a safe, non-toxic solution that provides effective fungus gnat control. The bacterium it contains continues to kill gnats in the soil for several weeks, ensuring that new generations do not infest your plants.
Pros:
- Biological control
- Safe for plants
- Long-lasting protection
- Non-toxic to pets
- Multiple formulations
- Effective on larvae
- Ideal for heavy infestations
Cons:
- Requires reapplication
- Only effective on larvae
- Slow action
12. Dr. Earth Final Stop – Best Fungus Gnat Insecticide for Organic Gardens
Dr. Earth Final Stop is an organic insecticide made with natural ingredients, including essential oils from rosemary and peppermint. It works effectively to control fungus gnats and other pests like aphids and spider mites. This insecticide is safe for organic gardeners looking for a non-toxic way to combat fungus gnats without harming the environment.
Dr. Earth Final Stop kills insects on contact and provides residual protection for up to several days. Its natural formula ensures it can be used safely around children and pets, making it a great option for households with young kids or animals. It’s especially beneficial for use on houseplants and small garden areas.
With its natural ingredients, this insecticide not only controls pests but also promotes plant health by keeping harmful chemicals away. It’s effective for both indoor and outdoor use and is a trusted choice for organic gardeners.
Pros:
- Organic
- Safe for pets
- Kills on contact
- Non-toxic
- Long-lasting protection
- Easy to use
- Effective on multiple pests
Cons:
- May require multiple applications
- Strong scent
- Can be expensive
13. Monterey Garden Insect Spray – Best Fungus Gnat Insecticide for Fruit and Vegetable Gardens
Monterey Garden Insect Spray is a versatile insecticide made from natural pyrethrins, a plant-based pesticide. It effectively targets and kills fungus gnats, aphids, and other pests in both fruit and vegetable gardens. The product works fast, killing adult gnats on contact and providing residual control for several days.
Pyrethrin, the active ingredient in Monterey’s spray, is derived from chrysanthemum flowers and is safe for use around pets and beneficial insects when applied correctly. The spray also provides a quick knockdown of pests, which makes it ideal for quick fungus gnat infestations.
For gardeners growing food crops, Monterey Garden Insect Spray is a safe and effective solution to keep fungus gnats and other pests at bay. It’s a powerful tool to use when managing pests in organic gardens and edible landscapes.
Pros:
- Organic formula
- Fast-acting
- Multi-pest control
- Safe for plants
- Effective for edible crops
- Easy to apply
- Residual control
Cons:
- Requires reapplication
- May harm beneficial insects
- Strong odor
14. Safer Brand 51703 Houseplant Insect Killer – Best Fungus Gnat Insecticide for Indoor Plants
Safer Brand 51703 Houseplant Insect Killer is designed to control fungus gnats and other common indoor pests. Its active ingredient, potassium salts of fatty acids, provides an effective yet gentle way to eliminate pests without causing harm to indoor plants. The insecticide works by suffocating pests, disrupting their ability to feed and reproduce.
This non-toxic solution is safe to use around children and pets, making it ideal for households with sensitive individuals. The product also offers a long-lasting effect, ensuring that fungus gnats and other pests won’t return quickly. It is suitable for use on all types of houseplants, from ornamental plants to small vegetables.
Safer Brand is a trusted name in eco-friendly pest control, and its Houseplant Insect Killer provides a simple and effective way to protect your indoor garden from fungus gnats and other pests. It’s an essential addition to any indoor plant care routine.
Pros:
- Non-toxic
- Safe for pets
- Easy to use
- Effective on multiple pests
- Long-lasting protection
- Indoor-friendly
- No harmful chemicals
Cons:
- May require multiple applications
- Slower acting
- Can leave residue
15. EcoLogic Garden Insect Killer – Best Fungus Gnat Insecticide for Vegetable Gardens
EcoLogic Garden Insect Killer is a natural insecticide that provides effective control of fungus gnats, caterpillars, aphids, and other pests. It contains ingredients such as plant oils that kill pests on contact while being safe for plants, pets, and humans. This product is particularly useful for vegetable gardeners seeking a safer alternative to chemical pesticides.
EcoLogic uses a blend of pyrethrins, which are derived from chrysanthemum flowers, to attack the nervous systems of insects. It offers quick results and is ideal for use on edible crops, such as tomatoes, peppers, and leafy greens. It can be used indoors and outdoors, giving gardeners versatility in pest management.
EcoLogic Garden Insect Killer is an excellent option for those who prefer to use natural insecticides while still achieving fast and effective results against fungus gnats.
Pros:
- Organic
- Safe for edible crops
- Fast-acting
- Multi-pest control
- Non-toxic
- Easy to apply
- No harmful chemicals
Cons:
- Requires reapplication
- May affect pollinators
- Can be costly
16. EcoSMART Organic Insect Killer – Best Fungus Gnat Insecticide for Lawn and Garden
EcoSMART Organic Insect Killer is a natural pesticide that uses plant-based oils to control fungus gnats and other pests in gardens and lawns. The product is non-toxic and safe for use around pets, children, and beneficial insects. It works by suffocating the pests, disrupting their feeding and breeding processes.
EcoSMART provides a fast-acting solution for fungus gnat infestations, especially in outdoor gardens. Its organic formula ensures that your plants remain free of harmful chemicals, making it an ideal choice for organic gardening. It also provides effective control against other pests like ants, aphids, and spider mites.
This insecticide is ideal for use in large garden areas, lawns, and vegetable patches, providing a broad spectrum of protection against pests. It’s easy to apply and provides effective results, making it a favorite among organic gardeners.
Pros:
- Organic
- Safe for pets and people
- Broad-spectrum pest control
- Fast-acting
- Non-toxic
- Easy application
- Safe for lawns
Cons:
- Requires reapplication
- Not effective on all pests
- May be too mild for severe infestations
17. Bayer Advanced Complete Insect Killer – Best Fungus Gnat Insecticide for Outdoor Gardens
Bayer Advanced Complete Insect Killer is a powerful insecticide that targets fungus gnats and a wide range of garden pests. It contains imidacloprid, a systemic insecticide that works through plant absorption, offering long-lasting protection. Once applied, it kills pests both above and below the soil, effectively addressing both adult and larvae stages.
This insecticide is suitable for use on vegetables, flowers, shrubs, and trees, making it highly versatile. The systemic nature ensures that even hidden pests in the soil or on plant roots are effectively eliminated. Bayer Advanced is easy to apply and works quickly, providing protection for several weeks.
For gardeners who need a long-lasting solution for fungus gnats and other pests, Bayer Advanced Complete Insect Killer is a top choice that offers lasting protection.
Pros:
- Systemic protection
- Long-lasting results
- Effective on adults and larvae
- Broad-spectrum pest control
- Easy to apply
- Fast-acting
- Versatile use
Cons:
- Toxic to beneficial insects
- Requires reapplication
- Not organic
18. Garden Safe Houseplant Insect Killer – Best Fungus Gnat Insecticide for Safe Indoor Use
Garden Safe Houseplant Insect Killer is designed for safe, effective pest control indoors. It’s made from natural plant oils, including rosemary and peppermint, which kill pests like fungus gnats on contact. This insecticide is safe for use on indoor plants and provides an eco-friendly solution for pest control.
It works by disrupting the feeding and reproductive systems of pests, making it effective against both adult gnats and larvae. The non-toxic formula ensures it’s safe to use around children and pets, which is an important consideration for indoor plant owners. It’s also effective in preventing the return of gnats when used regularly.
Garden Safe is an excellent choice for anyone looking for a safe and natural way to combat fungus gnats in indoor plants. It’s easy to apply and works well on houseplants of all types.
Pros:
- Non-toxic
- Safe for pets
- Effective on multiple pests
- Easy to apply
- Organic
- Fast-acting
- Indoor-friendly
Cons:
- Requires reapplication
- May not work on severe infestations
- Strong scent
19. Fertilome Tree & Shrub Systemic Insect Drench – Best Fungus Gnat Insecticide for Large Plants
Fertilome Tree & Shrub Systemic Insect Drench is a product designed for large plants, trees, and shrubs. It is absorbed by the plant, offering long-term protection from a variety of pests, including fungus gnats. The systemic nature of this insecticide makes it effective against pests that dwell in the soil, such as gnats.
Once applied, the product travels through the plant’s vascular system, killing pests that feed on the plant. This makes it an excellent choice for long-term control of fungus gnats in large garden areas or outdoor spaces. It also helps in preventing reinfestations.
Fertilome Tree & Shrub Insect Drench is a great option for gardeners with large plants that require a more hands-off approach to pest control.
Pros:
- Systemic action
- Long-lasting protection
- Effective on large plants
- Prevents reinfestations
- Easy to apply
- Versatile use
- Non-toxic to humans and pets
Cons:
- Not effective on all pests
- Requires patience for full effect
- May harm beneficial insects
20. Wondercide Natural Indoor Pest Control – Best Fungus Gnat Insecticide for Indoor and Outdoor Use
Wondercide Natural Indoor Pest Control is an all-natural insecticide made from plant-based ingredients, such as cedarwood oil and rosemary. It’s perfect for controlling fungus gnats both indoors and outdoors. The product is safe to use around pets, children, and beneficial insects, making it a family-friendly option for pest control.
This spray works by disrupting the nervous systems of pests, providing a fast and efficient way to eliminate gnats. It is particularly useful for gardeners looking for a non-toxic solution that can be safely applied to plants, furniture, and surrounding areas.
Wondercide is versatile and can be used in both garden and household settings. Its natural ingredients make it an attractive option for eco-conscious gardeners and homeowners alike.
Pros:
- Natural ingredients
- Non-toxic
- Safe for pets
- Fast-acting
- Versatile use
- Eco-friendly
- Effective on multiple pests
Cons:
- Requires multiple applications
- Strong scent
- Can be costly
Best Insecticide For Fungus Gnats FAQs:
-
How do I get rid of fungus gnats naturally? Use organic insecticides like Safer Brand traps, or natural predators like nematodes to control fungus gnat populations.
-
What is the best insecticide for fungus gnats in soil? Gnatrol Biological Insecticide works exceptionally well for controlling fungus gnat larvae in the soil.
-
Can I use insecticides indoors for fungus gnats? Yes, many insecticides, such as Safer Brand and BioAdvanced, are safe for indoor plants when used according to the instructions.
-
How do I know if I have fungus gnats? Look for small flying insects around your plants and check the soil for larvae, which appear as tiny worms.
-
Are all insecticides safe for pets? Not all insecticides are pet-safe. Always check the label for pet safety information before using.
-
How often should I apply insecticide for fungus gnats? Reapply insecticides based on the product’s instructions, usually every 7 to 14 days, until the infestation is under control.
-
Can fungus gnats damage my plants? Yes, fungus gnats damage plants by feeding on their roots, which can lead to stunted growth and other health issues.
Conclusion:
In conclusion, selecting the best insecticide for fungus gnats involves understanding your specific needs and the nature of the infestation. While chemical options like BioAdvanced Complete Insect Killer offer fast, effective results, organic solutions such as Safer Brand’s sticky traps and Gnatrol Biological Insecticide are excellent choices for eco-conscious gardeners.
BioAdvanced’s fast-acting properties make it a top contender for immediate control, while Gnatrol’s biological approach is a safer, sustainable choice for long-term prevention.
For the best overall product, BioAdvanced Complete Insect Killer stands as the best insecticide for fungus gnats due to its versatility and long-lasting effectiveness, while the runner-up, Gnatrol Biological Insecticide, offers a more eco-friendly solution for those seeking an organic approach to managing fungus gnats.
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