Microbe-Lift
Microbe-Lift BMC Biological Mosquito Control
Larvicide · EPA-registered biopesticide
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Pros
- A pourable Bti liquid made for ponds and water gardens, killing 90 to 100% of mosquito larvae in the water you dose.
- Safe to add straight to water with koi, frogs, and plants; Bti spares fish and wildlife and targets only larvae.
Cons
- Like all larvicides it thins next week's population rather than stopping bites now, so keep a repellent handy.
- You dose by water volume and re-treat on a schedule, and it only helps the water you actually pour it into.
The full review
Liquid Bti larvicide from Microbe-Lift, formulated for decorative ponds, water gardens, fountains, and other ornamental water where mosquitoes breed. You measure a dose into the water, and the same naturally occurring bacterium found in mosquito dunks goes to work killing mosquito and fungus gnat larvae before they can grow into biting adults. Because it is dosed by water volume rather than dropped in as a tablet, it suits larger or moving water features where you want even distribution. This is source control for the water itself, not a repellent for your skin or a spray for the air. A key advantage for pond keepers is that Bti is target-specific and documented as harmless to fish, koi, frogs, plants, birds, pets, and other wildlife, so it can be dosed directly into water that holds fish and aquatic life. It only treats the water you dose, so mosquitoes breeding elsewhere are unaffected.
Scorecard
Expand any pillar to see exactly why it scored what it did.
Effectiveness45%85Its job is to shrink your yard's mosquito population, and it does it well: it kills roughly 90–100% of the mosquito larvae in the standing water you treat. It stops larvae before they become biting adults, thinning the next generation of mosquitoes around a breeding site. Scored on that larval-control efficacy, discounted only because it reaches the standing water you can find and treat and not the mosquitoes breeding elsewhere (reasonable confidence).
Its job is to shrink your yard's mosquito population, and it does it well: it kills roughly 90–100% of the mosquito larvae in the standing water you treat. It stops larvae before they become biting adults, thinning the next generation of mosquitoes around a breeding site. Scored on that larval-control efficacy, discounted only because it reaches the standing water you can find and treat and not the mosquitoes breeding elsewhere (reasonable confidence).
Evidence & honest claims25%55Bti (Bacillus thuringiensis israelensis) is well-supported by published evidence, weighted by how close its concentration is to the studied effective dose (base 43). Of 4 marketing claims audited: 3 strong, 1 moderate, 0 weak, 0 unsupported (+12).
Bti (Bacillus thuringiensis israelensis) is well-supported by published evidence, weighted by how close its concentration is to the studied effective dose (base 43). Of 4 marketing claims audited: 3 strong, 1 moderate, 0 weak, 0 unsupported (+12).
Safety15%96This is a biological larvicide. Its active (Bti) targets only mosquito, black fly, and fungus gnat larvae and is documented safe for fish, pets, birds, bees, and other wildlife by the EPA, WHO, and CDC. It is designed to be placed directly in standing water, so there is no dermal exposure and negligible non-target hazard.
This is a biological larvicide. Its active (Bti) targets only mosquito, black fly, and fungus gnat larvae and is documented safe for fish, pets, birds, bees, and other wildlife by the EPA, WHO, and CDC. It is designed to be placed directly in standing water, so there is no dermal exposure and negligible non-target hazard.
Transparency15%65This product names its active ingredient (+30); uses a biological active whose potency is measured in living units, not a weight percent, so it is credited as fully disclosed (+35); does not publish a coverage figure (0).
This product names its active ingredient (+30); uses a biological active whose potency is measured in living units, not a weight percent, so it is credited as fully disclosed (+35); does not publish a coverage figure (0).
Every pillar is scored from published rules. Read how we score.
Larval control
This is a larvicide: it kills mosquito larvae in the standing water you treat, stopping them before they become biting adults. It lowers the local population over time but does not stop bites from mosquitoes bred elsewhere.
Mosquitoes
EstimatedHigh- Treated water
- Standing water
- Larvae killed
- 90–100%
The band shown is larval control, not personal bite protection. This is the same Bti active as mosquito dunks, delivered as a liquid dosed by water volume, and it is highly effective at killing mosquito and fungus gnat larvae in the water it treats. Coverage is set by dose rather than a fixed surface area (roughly 6 ounces per 2,000 gallons), so the square-foot field is left blank. It lowers the mosquitoes a pond or water garden would otherwise produce, which is real source control, but it does nothing for standing water you do not dose and will not stop adult mosquitoes arriving from elsewhere. Its standout feature for pond owners is non-target safety: Bti is documented as harmless to fish, koi, frogs, plants, birds, pets, and other wildlife, so it can be added directly to water that holds fish.
Ingredient disclosure
This product names its active ingredient (+30); uses a biological active whose potency is measured in living units, not a weight percent, so it is credited as fully disclosed (+35); does not publish a coverage figure (0).
Only active ingredients are disclosed. The full ingredient list (inerts/carriers) is not published, so this may not be the complete formula.
Active ingredient concentrations are not published for this product.
- Bti (Bacillus thuringiensis israelensis)Active
Active larvicide · concentration not disclosed
Claims audit
What the marketing says, versus what the evidence supports.
“Kills mosquito and fungus gnat larvae in ponds and water gardens”
EfficacyStrongAccurate. The Bti active kills mosquito and fungus gnat larvae in the treated water. This is larval source control, not skin protection.
“Will not harm fish, koi, birds, pets, plants or wildlife”
SafetyStrongWell supported. Bti is target-specific to Nematoceran larvae and is documented as safe for fish and other non-target organisms, which is why it is used in water that holds fish (EPA, NPIC).
“6 oz treats up to 2,000 gallons of decorative water”
OtherModerateA reasonable label dosing measure for a medium water garden. It describes how much water one bottle can dose, not how long control lasts, which depends on reapplication.
“Natural biological control that is safe for the aquatic environment”
NaturalStrongAccurate. Bti is a naturally occurring soil bacterium and, unlike pyrethroids, is documented as safe for fish and aquatic invertebrates, which is why it is dosed directly into ponds.
Safe around dogs & cats?
Worst case from this product’s active ingredients. Do not apply this or any human repellent to your pet.
Not veterinary advice. Full guide to repellents around pets →