Spiders Eat Mosquitoes: Your Natural Mosquito Control Allies

Mosquitoes are one of the most annoying and dangerous insect pests in the world, responsible for transmitting diseases like malaria, dengue, West Nile virus, and Zika. While most people reach for chemical repellents and traps, there is a natural mosquito control agent already at work in and around your home: spiders.

Which Spiders Eat Mosquitoes?

Most web-building spiders catch and eat mosquitoes that fly into their webs. The most effective mosquito-catching spiders include:

Cellar Spiders

Cellar spiders are among the most effective indoor mosquito catchers. Their loose, tangled webs are positioned in the dark, damp areas where mosquitoes also congregate — basements, bathrooms, and near water sources.

House Spiders

House spiders catch mosquitoes in their cobwebs, especially near windows and doors where mosquitoes enter.

Orb-Weaver Spiders

Orb-weaver spiders and garden spiders build large webs near exterior lights that attract mosquitoes at night. A single orb weaver can catch dozens of mosquitoes per night.

Jumping Spiders

Jumping spiders are active daytime hunters that will catch and eat resting mosquitoes. Some tropical jumping spider species (particularly Evarcha culicivora from East Africa) have been shown to specifically prefer blood-fed mosquitoes.

How Much Impact Do Spiders Have?

Quantifying spiders' impact on mosquito populations is challenging, but research provides some insights:

• A single web-building spider can catch and consume several mosquitoes per day.
• In natural ecosystems, spiders are significant predators of mosquitoes, particularly in humid environments.
• Studies in rice paddies have shown that spiders reduce mosquito populations enough to measurably decrease disease transmission.
• Global spider populations consume hundreds of millions of tons of insects annually, a meaningful portion of which are mosquitoes.

Encouraging Spiders for Mosquito Control

If you want spiders to help with mosquito control:

Outdoors

• Tolerate orb-weaver and garden spider webs near exterior lights.
• Avoid broad-spectrum pesticide applications that kill spiders along with other insects.
• Plant diverse vegetation to support spider populations.

Indoors

• Consider tolerating cellar spiders and house spiders in low-traffic areas.
• These spiders provide ongoing, maintenance-free mosquito control.

Specific Spider-Mosquito Interactions

Web Placement Matters

Spiders that build webs near standing water, in damp basements, or near exterior lights are positioned exactly where mosquitoes are most active. This is not a coincidence — natural selection has favored spiders that build webs where prey is abundant.

Cellar spiders in your basement or bathroom are often positioned near the moisture sources that also attract mosquitoes, creating an effective interception zone.

The Evarcha culicivora Connection

One jumping spider species from East Africa, Evarcha culicivora, has evolved a specific preference for blood-fed female mosquitoes. This spider can distinguish between mosquitoes that have recently fed on blood and those that have not, preferentially hunting the blood-fed ones. This is the only known predator that specifically targets malaria-carrying mosquitoes. While this species does not occur in North America, it illustrates how spiders can evolve specialized mosquito-hunting strategies.

Nocturnal Hunting Overlap

Many spider species are most active at night, which coincides with peak mosquito activity. Wolf spiders roaming at night encounter and catch mosquitoes resting on walls and other surfaces. Web-building spiders catch mosquitoes in flight during nighttime hours when many species are most active.

Spiders Are Not a Complete Solution

While spiders are helpful, they are not a substitute for comprehensive mosquito management:

• Eliminate standing water where mosquitoes breed — birdbaths, clogged gutters, flower pot saucers, and any container that holds water.
• Use screens on windows and doors to prevent mosquitoes from entering your home.
• Apply EPA-registered mosquito repellents when spending time outdoors.
• Consider mosquito dunks containing Bti in permanent water features like ponds and rain barrels.
• Maintain your yard by keeping grass trimmed and removing debris where mosquitoes rest.

Think of spiders as one layer in a multi-layered approach to mosquito management. They are a free, natural, and ongoing resource that supplements your other efforts. Eliminating spiders from your home and yard may actually increase your mosquito problem by removing a natural check on their population.

For more on the benefits of spiders and other pests they eat, see our related guides. For spider identification, see types of spiders and our complete guide to spiders.

Expert Insights

The pest control value of spiders is something I emphasize regularly in my practice. Over 15 years, I have helped clients understand that the spiders in and around their home are providing free mosquito control. In one case, a client wanted to eliminate all spiders from their screened porch. After I explained that the cellar spiders and cobweb spiders there were catching dozens of mosquitoes per day, they decided to leave them alone. Their mosquito problem on the porch noticeably improved that season. — Sarah Mitchell, BCE

Sources and References

• University of California Riverside Spider Research
• Burke Museum of Natural History and Culture
• National Pest Management Association (NPMA)

Main Causes

Spiders are naturally present in and around homes where insect prey is available. The same conditions that attract mosquitoes — standing water, dense vegetation, humid indoor spaces, exterior lighting left on at night — also attract the spiders that feed on them. Mosquito-abundant environments near water features, rain barrels, or persistently damp basements create sustained prey availability that supports resident spider populations. Areas with high overall insect activity, particularly near outdoor lights, concentrate prey that draws both mosquitoes and web-building orb-weavers to the same locations. According to UC IPM, spider populations are regulated primarily by prey availability, meaning environments with high mosquito pressure naturally develop corresponding spider activity. This relationship is largely self-regulating: spider populations in a given microhabitat reflect the insect resources in that environment, making prey reduction the most reliable way to manage both mosquito and spider activity simultaneously.

How to Identify

Identifying the spider species providing mosquito control helps inform a reasonable response to their presence. Cellar spiders — extremely long-legged, pale, and small-bodied — are among the most effective indoor mosquito catchers and are harmless; their loose, tangled webs in basements and bathrooms indicate active mosquito interception in those areas. House spiders build irregular cobwebs near windows and doors where mosquitoes enter, consuming them passively. Orb-weavers and garden spiders build large, neat circular webs near exterior lights at night; fresh web construction in the evening and a single spider resting at the hub confirm active outdoor mosquito control. Jumping spiders are compact, hairy, and active during the day, hunting resting mosquitoes on walls and window sills. Per UC IPM, these beneficial species can be distinguished from venomous indoor spiders by their body shape, eye pattern, and web type.

Risk and Severity

The spiders most effective at mosquito control are among the least dangerous to humans. Cellar spiders, house spiders, and orb-weavers — the primary mosquito-catching species in and around most North American homes — are harmless. None produces a medically significant bite, and bites are extremely rare even during direct handling. The risk from preserving these species for mosquito control is negligible. The risk from eliminating them is more concrete: removing a cellar spider population from a basement removes an active, continuous predator of the mosquitoes entering that space. According to the CDC, mosquitoes themselves represent a genuine public health concern as vectors of West Nile virus, dengue, and other diseases in the United States. Supporting spider populations that reduce mosquito numbers represents a low-risk component of an integrated pest management approach to residential vector control.

Solutions and Actions

For most spider species the goal is removing webs and reducing prey rather than chemical treatment. Vacuum or sweep down all visible webs weekly, including egg sacs, in garages, basements, attics, eaves, and exterior corners. Reduce indoor insect populations by maintaining screens, sealing entry points, and addressing any active pest issue — fewer insects means fewer spiders. Apply a residual insecticide barrier to the foundation perimeter, around windows and doors, and in eaves to deter newly arriving spiders. For confirmed black widow or brown recluse populations in storage areas, use professional pest control, wear long sleeves and gloves when handling stored items, and shake out shoes and clothing left in garages or basements. Single sightings indoors without webs are usually transient and need no chemical response.

Prevention

The most effective way to maximize spiders' mosquito control contribution is to maintain conditions that support resident spider populations while reducing the mosquito breeding sources generating the problem. Eliminate standing water on the property — empty plant saucers, clean clogged gutters, and treat permanent water features with Bti mosquito dunks. This reduces the mosquito population at the source, concentrating remaining mosquitoes where spiders are most active. Avoid broad-spectrum pesticide applications that kill spiders along with mosquitoes, as these remove the natural control layer without addressing breeding sources. Preserve cellar spider and house spider populations in low-traffic indoor areas by tolerating their webs in basements, utility spaces, and garages. Per NPMA, an integrated approach combining source reduction, physical exclusion through window screens, EPA-registered personal repellents for outdoor use, and biological control through resident spider populations achieves better sustained mosquito management than any single method alone.

Frequently Asked Questions

Do spiders really eat mosquitoes?

Yes. Many spider species, including cellar spiders, cobweb spiders, and jumping spiders, readily consume mosquitoes. Spiders are indiscriminate predators that will eat whatever prey is available, and mosquitoes are a common food source, especially for web-building spiders near outdoor lights where mosquitoes gather.

Can spiders help control mosquito populations?

Spiders contribute to natural mosquito population control, but they are not a standalone solution for mosquito problems. Their impact is greatest in enclosed or semi-enclosed spaces like porches, garages, and sheds where web-building spiders can intercept mosquitoes. For significant mosquito issues, integrated control methods including source reduction are necessary.

Which spiders are best at catching mosquitoes?

Web-building spiders like cellar spiders, cobweb spiders, and orb weavers are most effective at catching mosquitoes because their webs passively intercept flying insects. Jumping spiders also catch mosquitoes through active hunting. Research has shown that some jumping spider species are particularly attracted to blood-fed mosquitoes.

What should I recheck first for mosquito-eating spiders?

Recheck the exact place, timing, and repeated signs connected with mosquito-eating spiders before changing your plan. A single sighting or old web can mean something very different from fresh activity in several rooms. Confirm whether insects, clutter, moisture, gaps, or stored items are supporting the issue, then match the response to what you actually found.