Active Ingredient Profile

Metarhizium Fungal Bioinsecticide

Entomopathogenic Fungus (Biological Control)

Metarhizium anisopliae is a naturally occurring soil fungus that infects and kills insects through direct penetration of the exoskeleton. Unlike Bt (which must be eaten), Metarhizium works on contact - fungal spores land on the insect, germinate, penetrate the cuticle, and colonize the body from the inside.

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Classification
Entomopathogenic Fungus (Biological Control)
Signal Word
Exempt
Mode of Action
Contact infection: spores germinate on insect cuticle, penetrate exoskeleton, colonize hemocoel, produce toxins (destruxins), kill host
⚖️ Educational use only. Always read and follow the full product label — the label is the law under FIFRA. Full disclaimer → | ⚗️ Mixing Calculator →

Target Pests

Ticks (excellent - Met52 is specifically registered for tick control), termites, mosquito larvae, white grubs, root weevils, thrips, spittlebugs, grasshoppers, beetles. Very broad host range across many insect orders. Does NOT infect mammals, birds, fish, or plants.

Products and Brand Names

Met52 EC (Novozymes/FMC - tick and ornamental pest control), BioCane (sugarcane grub control, Australia), Green Muscle (locust control, Africa), various experimental and regional products. Growing commercial availability as biocontrol gains mainstream acceptance.

Safety and Precautions

Completely non-toxic to mammals, birds, fish, and plants. Cannot infect warm-blooded animals because Metarhizium cannot grow above 95F (35C) - mammalian body temperature kills the fungus. Safe around children, pets, and wildlife. OMRI organic approved.

Temperature selectivity: This is one of the most elegant safety mechanisms in biological control. Metarhizium cannot survive at mammalian body temperature (98.6F/37C), making infection of warm-blooded animals physically impossible. Cold-blooded insects have no such protection.

Pro Tips

For ticks: Met52 applied to lawn borders, woodland edges, and leaf litter can reduce tick populations by 50-75% in treated areas. The fungal spores persist in the leaf litter and infect questing ticks on contact. Multiple applications per season recommended.

How infection works: Spores land on the insect cuticle. Within 24 hours, they germinate and produce an enzyme (chitinase) that dissolves through the exoskeleton. The fungus enters the body cavity, multiplies, produces destruxin toxins, and kills the insect in 3-7 days. The insect then becomes covered in green spores, which can infect other nearby insects.

Environmental persistence: Unlike chemical pesticides that degrade, Metarhizium persists and reproduces in the soil ecosystem. A single application can provide weeks to months of ongoing control as the fungus cycles through pest populations.

🐛 Pests This Treats — Learn More

Click any pest to view its full identification guide, biology, and treatment options.

🐛 Ants → 🐛 Grubs → 🐛 Mites → 🐛 Mosquito → 🐛 Scales → 🐛 Termites → 🐛 Thrips → 🐛 Ticks → 🐛 Weevils →
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❓ Frequently Asked Questions

Q: Is metarhizium safe for pets?
Follow the product label. Keep pets out of treated areas until completely dried (2–4 hours for sprays). Once dry, treated surfaces pose minimal risk to dogs and cats.
Q: Can I use metarhizium indoors?
Check the specific product label — formulations vary. Baits and dusts often have indoor labeling; concentrates and granulars are typically outdoor.
Q: How long does metarhizium last after application?
Residual varies by formulation, surface type, weather, and UV exposure. Indoor applications last longer than outdoor. Check the product label for re-application intervals.
Q: What should I do if exposed?
Remove contaminated clothing, wash skin with soap and water. For eye contact, rinse 15–20 minutes. For ingestion or severe symptoms, call Poison Control (1-800-222-1222). Have the product label available.

📋 Safety Data Sheet (SDS)

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Metarhizium Fungal Bioinsecticide — Safety Data Sheet

View the official SDS document for this product directly on the CDMS label database.

📄 View SDS on CDMS → 🏛 Search EPA Label Database →
Metarhizium Fungal Bioinsecticide Safety Data Sheet page 1
📄 Metarhizium Fungal Bioinsecticide — Safety Data Sheet · View the complete SDS document above or download below
📄 CDMS Label & SDS Database 📄 EPA Label Search
Did you know? Metarhizium has been used as a bioinsecticide since 1879, making it one of the first biological control agents ever deployed. In Africa, it is the primary weapon against desert locust swarms, applied aerially over millions of acres - proving that biological control can work at massive scale.
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Reviewed by Derek GiordanoContent reviewed by a licensed pest management professional. Last reviewed: April 2026.
📚 Sources: EPA Pesticide Labels · NPIC Pesticide Info

Known limitations of Metarhizium Fungal Bioinsecticide

No active ingredient is universal, and Metarhizium Fungal Bioinsecticide has specific weak points worth understanding before purchase. Resistance is the most common limitation — populations in heavily-treated areas (commercial kitchens, multi-unit housing, urban cores) often show measurable tolerance compared to populations in less-treated environments. Rotating between chemical classes every two or three applications reduces resistance pressure significantly.

Substrate binding is another limitation. Metarhizium Fungal Bioinsecticide on highly absorbent surfaces like unfinished wood or carpet can become bound to the substrate within hours of application and never reach the pest in active form. For these surfaces, dust formulations or baits perform better than liquid sprays. Crack-and-crevice application using a precision tip places product where it reaches the pest while minimizing exposed-surface residue.

Pollinator and beneficial-insect impact is the third limitation to plan around. Outdoor application timing should avoid blooming plants, and any application near beneficial habitat (gardens, water features, pollinator strips) should be made in late evening when beneficials are inactive.

How Metarhizium Fungal Bioinsecticide performs in real-world conditions

Laboratory efficacy numbers for Metarhizium Fungal Bioinsecticide rarely match field performance, and the gap is wider for some product categories than others. Residual life on porous surfaces (brick, unsealed wood, concrete) is typically 30 to 50 percent shorter than on the sealed lab surfaces used in registration data. Direct sunlight reduces persistence further — UV breakdown can cut a 90-day residual to under 45 days on south-facing exterior walls. For interior treatments these effects are smaller, but humidity, cleaning products, and foot traffic all reduce real-world residual life.

Temperature interaction is equally important. Metarhizium Fungal Bioinsecticide, like most modern active ingredients, has an optimal temperature window for both delivery and pest susceptibility. Outside that window, the same dose may underperform by half. Field operators usually adjust application timing rather than rate to compensate, since increasing the rate beyond label specification produces diminishing returns and increases off-target risk.

Mixing partners and tank-mix compatibility also affect real-world performance. Adding an insect growth regulator extends control by addressing eggs and immatures that the adulticide misses. The cost premium for a tank mix is usually under 20 percent and doubles the effective control window.

Comparing Metarhizium Fungal Bioinsecticide to alternatives

Choosing between Metarhizium Fungal Bioinsecticide and a comparable product usually comes down to four factors: speed of kill, residual length, target spectrum, and household-sensitivity profile. No single product wins on all four — fast-acting contact kills typically have short residuals, while long-residual products often act slowly enough that homeowners assume they have failed within the first 48 hours. Matching the product to the situation is more important than picking the strongest available option.

Cost per application is a useful but incomplete metric. A cheaper concentrate that requires more frequent reapplication often costs more per season than a more expensive product with a longer effective window. Coverage area per gallon at the label rate is the better comparison number, and it is usually printed clearly on the label.

For most households, keeping two complementary products — one fast-acting and one long-residual, ideally from different chemical classes — covers more situations than a single all-purpose product and supports the resistance-management rotation noted above.

Published: Jan 1, 2025 · Updated: Apr 7, 2026

Storage and disposal of pesticide products

Pesticide storage and disposal practices have meaningful safety and environmental implications that many homeowners overlook. Storage practices that matter: keep products in original containers with intact labels (decanting is a documented poisoning cause and makes label-required information unavailable when needed), store in a locked area or cabinet inaccessible to children and pets, separate from food and animal feed, in a temperature-controlled location (extreme cold and extreme heat both degrade many products), and elevated above floor level to prevent contamination from spills. Disposal practices: never pour unused products down drains, on the ground, or into household trash; consult the label disposal instructions and your municipality's household hazardous waste program (most jurisdictions have collection events or permanent sites), and use up small remaining quantities at label rates rather than disposing of partial containers when possible. Empty containers, after triple rinsing as the label specifies, can typically go in recycling or trash per the label, but rinsate must be applied as the original product would be.

Pest pressure as a property value signal — and how to address it before listing

Pest issues directly affect property valuation in several documented ways: termite damage is a standard inspection finding that can derail closings or require significant credits; rodent activity in attics and crawlspaces flags during inspections and creates buyer concerns about hidden damage; visible cockroach or bedbug activity raises the question of what else has been neglected. Sellers who address pest issues before listing — ideally with documentation of treatment and a clean follow-up inspection — preserve more value than those who try to negotiate around buyer-discovered issues. The investment is typically modest relative to the price impact: a pre-listing inspection by a licensed pest control company runs a few hundred dollars in most markets, and resolving common findings (rodent exclusion, ant treatment, wasp nest removal) is rarely a significant expense. The value preservation comes from removing inspection findings as negotiation leverage, not from any single repair.

Application timing within the day and weather conditions

Pesticide applications produce significantly different results depending on application timing, and matching application to conditions improves outcomes substantially. For outdoor liquid applications, early morning (after dew has evaporated, before pollinators are active) and late evening (after pollinators have stopped foraging, before evening dew) produce best results: temperatures are moderate, wind is typically lower, and non-target exposure is reduced. Mid-day applications during high temperatures cause volatility losses and faster degradation. For interior treatments, timing depends on the pest: cockroach baiting works at any time but should follow rather than precede cleaning; bed bug treatments need to follow vacuuming and clutter reduction; ant baits work best when active trails are present, which often means specific times of day for specific species. Rain within 4 hours of outdoor liquid application washes off most surface residue except specifically rainfast formulations; checking the next 24-hour forecast before any outdoor treatment is the basic discipline that prevents this loss. Temperatures above 90°F or below 50°F outside the product label's recommended range produce reduced efficacy.

Why most pest 'sightings' aren't what people think they are

Species misidentification is the single most common reason that DIY pest treatment fails or that homeowners describe products as not working. The patterns are consistent: bed bug bites are routinely attributed to mosquitoes, fleas, or unknown causes; carpet beetle larvae are mistaken for bed bug nymphs; small black ants are called 'sugar ants' regardless of actual species; carpenter ants and termites are confused despite very different treatments; bat bugs are treated as bed bugs (the treatment may work, but the actual problem is overhead). Even when identification is correct at the family level, species within a family often require different approaches — German vs. American cockroaches, subterranean vs. drywood termites, or pavement vs. carpenter ants are practical examples. The first hour of any pest problem should go to identification, not treatment: photograph specimens with a coin for scale, send images to a local cooperative extension office (most respond within a day or two), or post to one of the moderated identification forums where entomologists answer. Correct identification narrows treatment options to those that actually work and discards the larger pile that don't.

Pesticide rotation and the resistance management problem

Resistance management — using multiple active ingredients in sequence so that no single mode of action selects for resistant individuals — is standard practice in agricultural and commercial pest control but rarely makes it into residential treatment decisions. The underlying concern is real: chronic use of a single pyrethroid product against bed bugs has produced widespread pyrethroid resistance, with some populations now showing resistance factors of 1000x or more. The same pattern is documented in German cockroach resistance to chlorpyrifos and other historical actives, mosquito resistance to organophosphates in heavy-use regions, and house fly resistance across multiple compound classes. For residential treatment, the practical implication is to avoid using the same active ingredient repeatedly across multiple treatment cycles; rotating between products in different chemical families (e.g., pyrethroid → neonicotinoid → insect growth regulator → carbamate, or whatever subset is appropriate to the target pest) reduces selection pressure and preserves efficacy. The product label specifies the active ingredient family, allowing rotation choices to be made on actual chemistry rather than brand name.

Pesticide drift and the neighbor dimension

Pesticide drift — the off-target movement of applied product through air, water, or runoff — is an under-discussed dimension of residential pesticide use, but it's an increasingly common source of conflict between neighbors and a real factor in the cumulative environmental load of pesticide use. Foliar sprays applied in even light wind drift further than most homeowners expect, particularly with finer droplet sizes. Granular products applied near property lines wash into adjacent properties in significant rainfall. Mosquito fogging can move across multiple properties depending on conditions. The implications are partly legal — drift onto neighboring property without consent has been the basis of successful nuisance claims in some jurisdictions — and partly ethical. Applying products only in low-wind conditions, choosing coarser droplet sizes when possible, using granulars rather than sprays near property lines, and timing applications to avoid imminent rainfall all reduce drift. For homeowners concerned about pesticide exposure from neighbors' applications, the productive conversation is usually about timing and product choice rather than about pesticide use in general, and approaching it that way tends to produce cooperation rather than escalation.

Why product instructions are often suboptimal in practice

Pesticide labels are legal documents written to satisfy regulatory requirements, not field guides written to maximize success in a specific home. The instructions cover the broadest reasonable use case, which means they're rarely tuned for the specific construction type, climate, or pest pressure you're dealing with. A label might call for application every six weeks because that's what the registration data supports across a wide range of conditions, but the actual reapplication interval that matches the residual life of the active ingredient in your specific application context could be shorter or longer. This is not an invitation to ignore label directions — doing so is illegal and frequently dangerous — but it does mean that following the label is the floor, not the ceiling, of good practice. Knowledgeable users overlay the label with conditions-aware judgment: shorter re-treatment intervals during heavy rain or high humidity, denser application in known harborage, and supplementary monitoring after treatment to verify that the work actually performed as expected. The label tells you what's permitted; experience tells you what's optimal within that envelope.

Reduced-risk pesticide selection: a category worth knowing

The EPA's reduced-risk pesticide program identifies active ingredients and formulations that meet specific criteria for lower toxicity to non-target organisms, reduced potential for groundwater contamination, lower likelihood of resistance development, or better compatibility with integrated pest management. Products in this category aren't free of toxicity — they're pesticides, and all pesticides have some toxic profile — but they represent the lower end of the risk distribution within their pest categories. For homeowners who want to use pesticides but are concerned about minimizing exposure and environmental impact, looking for products with reduced-risk actives is a defensible filter. Examples include some of the diamide insecticides, spinosyns, and certain microbial products. The catch is that retail availability lags behind the professional market for many reduced-risk products, and consumer pesticide aisles still skew heavily toward older pyrethroid and carbamate formulations. For homeowners willing to source products from agricultural supply channels or work with a pest control company that uses these products, the option exists; for those buying off the shelf at typical retail, the choices are narrower.