Mosquito Bits: what they do and how to use them right

Last updated 2026-08-14

What are Mosquito Bits and how do they work?

Mosquito Bits is a brand name product (Summit Responsible Solutions) made of ground corn cob granules soaked in a bacterium called Bacillus thuringiensis subspecies israelensis, usually shortened to Bti. You sprinkle the granules onto standing water. Mosquito larvae feeding in that water ingest the Bti spores and toxins, and within a day or two the larvae die before they can grow into biting adults. Bti works because mosquito larvae are filter feeders. They constantly strain water for organic particles, and the granules release Bti crystals that look like food to the larvae. Once ingested, the toxin punches holes in the gut lining of the larva. Mammals, birds, fish, and beneficial insects don't have the gut receptors that Bti proteins bind to, so it doesn't harm them the same way. The EPA registers Bti-based larvicides for use in standing water, including birdbaths, ornamental ponds, rain barrels, and tree holes, when applied according to the label. This is not a magic ingredient unique to one brand. Bti has been used in mosquito control programs since the late 1970s, and it's also the backbone of larger-scale products like Mosquito Dunks (a slow-release tablet form) and aerial larvicide programs run by mosquito control districts ^[1]. Mosquito Bits are just a fast-acting granule version, good for quick knockdown in small water features you check often. One honest limitation: Bits break down fast, often in a week or less, so they're built for short bursts of control rather than season-long dosing. If you want longer residual action in the same water body, the same brand makes a Dunks version with a slower release, and some product lines combine the two. Bti products only kill larvae. They do nothing to adult mosquitoes flying around your yard. That distinction matters a lot for how you think about total control, which we get into below.

Do Mosquito Bits actually get rid of mosquitoes?

They reduce the number of new mosquitoes hatching from the water sources you treat. That's a real and useful effect, but it is not the same as getting rid of mosquitoes in your yard. Here's the honest math: a female mosquito can lay 100 to 300 eggs per batch, and many species can produce several batches over a lifetime that may last a few weeks to a couple months depending on species and conditions ^[1]. If you're treating your bird bath, rain barrel, and gutters weekly with Bti, you're stopping a real chunk of local production. But mosquitoes are strong enough fliers that neighbors' untreated water, storm drains, and puddles you never see can still be feeding a population that shows up in your yard every evening. Think of larvicide as one leg of a stool. It stops new mosquitoes from your own standing water. It does not touch the adults that migrate in from elsewhere, and it does nothing for resting adult mosquitoes hiding in shrubs, ivy, and shaded vegetation during the day. For that, most homeowners layer in a barrier spray or an automated misting system that targets resting adults directly. For a broader look at how these methods stack up, see mosquito control.

How to get rid of mosquitoes in your backyard

A real backyard reduction plan has three parts working together: source reduction, larviciding, and adult control. Skipping any one of them means you're only getting partial results. Start with source reduction. Walk your property after it rains and dump, drill, or cover anything holding water for more than a few days: tarps, kiddie pools, clogged gutters, saucers under potted plants, old tires, tree stumps with hollows. The CDC notes that mosquitoes can complete their life cycle from egg to adult in as little as 7 to 10 days depending on temperature and species, so a puddle that sits for a week is enough time to produce a new batch ^[2]. For water you can't dump (ornamental ponds, rain barrels, low spots that always collect a little water), that's where Mosquito Bits and similar Bti products come in. Treat weekly, following label directions on dosage per gallon. For adult mosquitoes already resting in your landscaping, vegetation control and a barrier treatment do the heavy lifting. Mosquitoes rest in tall grass, ivy, dense shrubs, and shaded mulch beds during the day. Keeping grass mowed and shrubs trimmed removes some resting habitat on its own. Barrier sprays, applied to the underside of leaves and shaded areas on a 10 to 14 day cycle through the season, are what most professional services use to knock down adult populations between rains ^[3]. Misting systems automate that same idea with scheduled or app-triggered bursts from tubing installed around the yard's perimeter. None of these methods, alone or combined, eliminates mosquitoes completely. What a good combined program does is knock the population down enough that you can sit outside at dusk without getting eaten. If you're comparing whether a DIY approach or a professional barrier plan makes more sense for your yard size, a free yard assessment from a local service can tell you what's actually breeding nearby that you can't see from your porch. Get a free yard assessment.

How do you keep mosquitoes away once you've knocked them down?

Keeping mosquitoes away is about maintenance, not a one-time fix. Mosquito populations rebuild from eggs and pupae you missed, from neighboring yards, and from rain events that create new puddles overnight. The basic weekly habits: dump standing water every few days, keep gutters clear, treat ornamental water features with Bti product on a schedule, and keep grass and shrubs trimmed to reduce resting spots. In many regions, adult mosquito populations are lowest right after a barrier treatment and start climbing again around day 10 to 14 as new adults emerge and residue breaks down, which is why professional programs treat on that same cycle ^[3]. Personal repellents fill the gap between treatments. The EPA recommends products registered with them containing DEET, picaridin, IR3535, oil of lemon eucalyptus (OLE), 2-undecanone, or para-menthane-diol (PMD) as effective active ingredients for skin application, and their search tool lets you find EPA-registered options by ingredient and duration ^[4]. For more on how these products compare, see mosquito repellent and natural mosquito repellent if you're looking at plant-based or lower-DEET options. Fans matter more than people expect. Mosquitoes are weak fliers, and a box fan or ceiling fan on a patio can physically disrupt their ability to land on you, which several extension entomologists point to as a cheap, low-effort deterrent for patios and decks.

What plants repel mosquitoes, and does a mosquito repellent plant actually work?

A mosquito repellent plant is any plant that contains natural compounds mosquitoes find irritating or that mask the carbon dioxide and skin odors mosquitoes use to find you. Citronella grass, lemon-scented geranium, lavender, catnip, marigold, and basil are the plants most commonly cited for this. The honest answer on effectiveness: these plants release their repellent oils when the leaves are crushed or disturbed, more than by sitting in a pot on your patio. A potted citronella plant on the porch is not equivalent to spraying citronella oil on your skin. University extension guidance generally describes these plants as having limited, localized effect at best, and no controlled field study shows a container garden meaningfully reducing bite rates in an open yard. That doesn't mean plant them for nothing. They smell good, they're often useful in cooking (basil, mint), and crushing a few leaves and rubbing them on skin or clothing can give short-term, mild relief in a pinch. Just don't expect a row of marigolds to replace an actual repellent or a barrier treatment. If you want a full comparison of what has actual evidence behind it, natural mosquito repellent covers essential oils, plants, and which registered products test well.

How to get rid of mosquitoes in the house

Mosquitoes get inside through gaps in door sweeps, torn window screens, and open doors during the evening when populations peak outside. Getting them out and keeping them out is a two-step process: remove what's already inside, then seal the entry points. To clear mosquitoes already in the house, check dark, humid spots first: under sinks, closets, behind curtains. A handheld vacuum or a simple swat gets them without chemicals. Indoor foggers and plug-in repellents containing pyrethrins or pyrethroids are EPA-registered for indoor use per label directions, but they're a short-term knockdown, not a long-term fix if the entry point stays open. For the entry points: repair torn screens, check that door sweeps seal fully, and look at window AC units, which often leave a gap around the unit that mosquitoes exploit. If you have a lot of houseplants that sit in trays of water, check those too. A saucer under a plant that holds standing water for a week is enough for mosquito larvae to develop indoors, which is an underrated source homeowners miss constantly.

When do mosquitoes go away for the season?

Mosquitoes typically die back or become dormant once temperatures drop consistently below about 50°F, since most species become inactive in cold weather, though exact timing varies hugely by region and species ^[5]. In northern states this can mean a hard stop by mid-to-late October; in the Gulf Coast and much of the Southeast, mosquitoes can remain active nearly year-round during warm spells. Cold doesn't mean mosquitoes are gone for good. Many species overwinter as eggs that survive freezing and hatch the following spring when water and warmth return, while a few species overwinter as adults in protected spots like culverts, tree holes, or crawl spaces. That's why a hard freeze in November doesn't guarantee a mosquito-free yard the following April; it just means the current adult generation dies off while eggs and dormant adults wait it out. Because timing varies so much by climate zone, your best source for local first-and-last-frost mosquito activity dates is your state or county extension office or local mosquito control district, which track species and seasonal activity specific to your area ^[6]. This is also why professional barrier programs are typically framed as seasonal, starting in spring and running through the first hard frost, rather than a fixed calendar.

How to get rid of ticks in your yard

Tick control in a yard depends on breaking the humidity and shade that ticks need to survive, plus targeted treatment where they actually live. Ticks don't jump or fly. They quest, meaning they climb tall grass or leaf litter and wait with legs extended for a host to brush past. The CDC and university tick research point to a few yard modifications that measurably reduce tick presence: keep grass mowed short, clear leaf litter and brush, and create a 3-foot-wide barrier of wood chips or gravel between your lawn and any woods or stone walls bordering the property, since ticks rarely cross a dry, sunny strip like that on their own . Ticks concentrate heavily at habitat edges, meaning the transition zone between your lawn and woods, brush, or tall grass is where the vast majority of ticks in a yard are found, not the open lawn itself. For active treatment, acaricide (tick-killing pesticide) barrier sprays applied to those edge zones, under shrubs, and along stone walls in spring and again in early-to-mid summer can meaningfully reduce tick numbers, based on university extension trial data . This is different from the mosquito barrier cycle; ticks don't need the same 10-14 day retreatment because they don't reproduce and disperse the way adult mosquitoes do, but a professional program often treats both pests on a coordinated seasonal schedule since the habitat management overlaps heavily. If ticks are a bigger concern than mosquitoes for your property, tick repellent covers personal protection layers to pair with yard treatment.

How do you get rid of ticks from your yard for good?

There's no yard treatment that removes ticks permanently, the same way there's no mosquito treatment that eliminates mosquitoes permanently. Ticks get reintroduced constantly by deer, rodents, birds, and even your own pets moving through neighboring wooded areas. The realistic goal is sustained reduction, not eradication. The combination that extension research backs up most consistently: habitat modification (mowing, clearing leaf litter, the wood-chip barrier strip), host management (deer fencing or repellent where deer traffic is heavy, since deer are a major tick host and reproductive driver), and targeted acaricide application at habitat edges rather than blanket-spraying the whole lawn . A study cited by the CDC found that landscaping modifications combined with targeted pesticide application reduced tick abundance significantly more than either approach alone, though results vary by region and tick species . Checking pets for ticks after they've been in brushy areas, and doing a tick check on yourself and kids after yard work, closes the loop that yard treatment alone can't. If your yard borders woods, a stone wall, or a field, and you're seeing ticks on pets or people regularly, that's usually a sign the edge habitat needs both a physical barrier and a spring/summer spray cycle rather than a single treatment.

Mosquito Bits vs. a full mosquito control program: what's the real difference?

Mosquito Bits / Bti larvicide	Larvae in standing water	Weekly, per label	Nothing for adult mosquitoes or water you don't treat
Source reduction (dumping water)	Breeding sites	Every few days, after rain	Doesn't stop mosquitoes flying in from elsewhere
Barrier spray (DIY or professional)	Resting adult mosquitoes in vegetation	Every 10-14 days in season [3]	Doesn't stop new larvae in untreated water
Misting system	Resting and flying adults, scheduled bursts	Automated, several times daily or on demand	Requires installation; upfront system cost
Personal repellent (DEET, picaridin, etc.)	Mosquitoes actively biting you	Reapplied per label, hours-based	Only protects the person wearing it	A homeowner doing everything right, dumping water weekly and treating a birdbath with Bits, can still get eaten on the patio at 7pm because the adult mosquitoes came from the neighbor's uncovered rain barrel three yards over. That's the gap that barrier treatments and misting systems are built to close. At Duskproof, the barrier plans we quote run on that same 10 to 14 day cycle that university extension data shows keeps adult populations suppressed between visits, and we start every plan with a free yard assessment to find the standing water and resting habitat a homeowner usually can't spot alone. If you're trying to decide between a DIY larvicide-and-dump routine versus a seasonal service, the honest answer is: DIY handles small, contained water sources fine. It doesn't touch the adult population problem that drives most of the biting you actually notice at dusk.

Mosquito Bits and similar Bti larvicides handle one job well: stopping larvae in standing water you control. A full mosquito control program handles the rest, adult mosquitoes resting in vegetation, mosquitoes flying in from neighboring properties, and the recurring nature of the problem through an entire season. |Method|What it targets|How often|What it doesn't do|

What's the right way to apply Mosquito Bits or any larvicide safely?

Always follow the specific product label, since dosage, water types, and reapplication intervals vary by product and are legally binding instructions, more than suggestions. The EPA registers Bti products for use in non-flowing or slow-moving water like ponds, birdbaths, rain barrels, tree holes, and roof gutters; check the label for whether your specific water body is listed. Don't use Bti products in swimming pools, water intended for drinking without proper filtration, or any water body the label excludes. Store product away from children and pets per label directions, and don't apply more than the labeled amount thinking it'll work faster or longer; Bti degrades on a fairly fixed timeline regardless of dose. For water features with fish, Bti is generally considered to have low toxicity to fish at labeled rates, but always check the specific product label and consider your state's guidance if you have a koi pond or similar feature you want to be extra careful with. If you're unsure whether a specific water feature is safe to treat, your local extension office or a professional mosquito control service can advise on your specific setup, which is part of what a free yard assessment covers when a technician walks your property.

Frequently asked questions

How do you get rid of mosquitoes fast?

For immediate relief outdoors, a fan on the patio disrupts their weak flight, and an EPA-registered repellent on skin (DEET, picaridin, or oil of lemon eucalyptus) stops bites within minutes ^[6]. For longer-term reduction, dump standing water and treat any you can't dump with a Bti larvicide. There's no single fast fix for a whole yard population; that takes a repeat barrier treatment cycle.

How do you keep mosquitoes away from your patio or deck?

Run a fan, since mosquitoes are weak fliers and struggle against moving air. Trim back shrubs and tall grass near the patio where mosquitoes rest during the day, dump any nearby standing water weekly, and consider citronella candles or coils for modest, short-range relief. For consistent evening use, a barrier spray or misting system covering the vegetation around the patio does more than any single product.

How do you get rid of ticks on your body or clothing?

Remove attached ticks with fine-tipped tweezers, grasping close to the skin and pulling straight up steadily, per CDC guidance, then clean the bite with soap and water or alcohol ^[9]. For ticks crawling on clothing, a lint roller or tape works. Save the tick in a sealed bag if you develop symptoms later, since your doctor may want to identify the species.

What is a mosquito repellent plant?

A mosquito repellent plant is a plant containing natural oils, like citronella grass, lemon-scented geranium, lavender, catnip, or basil, that mosquitoes find irritating when the leaves are crushed or the oil is extracted. Simply growing the plant in a pot has limited effect since the oils need to be released and applied; it's a mild supplement to real repellents, not a replacement.

What plants repel mosquitoes most effectively?

Citronella grass, catnip, lemon-scented geranium, lavender, and basil are the most commonly cited options, based on the essential oils they contain. None have strong field-trial evidence showing meaningful bite reduction just from being planted nearby; their oils work better when extracted, crushed, or applied directly than left growing in a container.

How do you get rid of mosquitoes in your house quickly?

Check dark, humid areas first (closets, under sinks, behind curtains) and remove mosquitoes by hand, vacuum, or swatting. Check houseplant saucers for standing water, which can breed larvae indoors. Then seal entry points: repair torn screens, check door sweeps, and look at gaps around window AC units, since that's usually how they got in to begin with.

How do you get rid of mosquitoes in the house for good?

Getting rid of mosquitoes indoors long-term means closing entry points permanently: fix torn screens, seal gaps around window units and door sweeps, and eliminate any standing water indoors, including plant saucers and unused vases. One-time removal (vacuuming, swatting) only handles mosquitoes already inside; it does nothing to stop the next one from getting in the same way.

When do mosquitoes go away for the season?

Most mosquito species become inactive once temperatures drop consistently below about 50°F, which in northern states often means mid-to-late October, while warmer southern regions can see activity nearly year-round ^[7]. Cold doesn't kill the population permanently; many species overwinter as eggs and hatch again in spring. Check your local extension office for typical dates in your specific region ^[8].

How do you get rid of mosquitoes in your backyard long-term?

Long-term backyard control combines three things: dumping or treating every standing water source weekly, trimming vegetation where adults rest during the day, and applying a barrier spray on a repeat cycle (commonly every 10-14 days through the season) to knock down adult populations ^[5]. No single step gets you all the way there; skipping any one leaves a gap mosquitoes exploit.

How do you get rid of ticks from your yard?

Mow grass short, clear leaf litter, and create a 3-foot dry barrier of wood chips or gravel between lawn and woods, since most yard ticks concentrate at that habitat edge rather than the open lawn ^[9]. Targeted acaricide sprays at those edges in spring and early summer add further reduction, based on university extension trial data ^[10]. Manage deer traffic too, since deer are a major tick host.

Do Mosquito Bits kill ticks?

No. Mosquito Bits contain Bti, a bacterium specific to mosquito and some fly larvae in water; it has no effect on ticks, which live in leaf litter and vegetation, not standing water. Tick control requires separate methods: habitat modification and acaricide products labeled specifically for ticks.

Are Mosquito Bits safe for pets and fish?

Bti-based products are EPA-registered for use in water features per label directions and are generally considered low-risk to fish, birds, and mammals at labeled rates because Bti targets receptors specific to mosquito larvae guts ^[1]. That said, always follow the specific product label for your water feature type, and no pesticide should be described as fully harmless; use as directed.

How long do Mosquito Bits take to work?

Mosquito larvae typically die within 24 to 48 hours of ingesting Bti from treated water, though the granules themselves usually only provide about a week of active control before needing reapplication, since Bti breaks down relatively fast in the environment. For longer residual action in the same water source, slower-release tablet forms of Bti are also available.

Sources

1. CDC, Mosquito Life Cycle: Female mosquitoes can lay 100-300 eggs per batch and produce multiple batches over their lifespan
2. EPA, Find the Repellent that is Right for You: EPA-registered repellent active ingredients include DEET, picaridin, IR3535, oil of lemon eucalyptus, 2-undecanone, and PMD
3. CDC, Mosquitoes: Most mosquito species become inactive when temperatures drop consistently below about 50°F and some species overwinter as eggs
4. CDC, Mosquito Control Programs and Partners: Local mosquito control districts and extension offices track region-specific mosquito activity and seasonal timing
5. CDC, Preventing Tick Bites on People: Yard modifications like mowing, clearing leaf litter, and creating a wood-chip barrier reduce tick presence at habitat edges, and proper tick removal uses fine-tipped tweezers
6. CDC, Preventing Ticks in the Yard: Targeted acaricide application at yard edges combined with habitat modification reduces tick abundance more than either method alone