The simplest way to get rid of Joro spiders is to knock them down with a stick or broom. These spiders are not aggressive, their fangs rarely penetrate human skin, and they’re easy to physically remove from porches, eaves, and other structures they love to colonize. For larger infestations or hard-to-reach webs, several sprays kill them on contact, though the key word is “on contact.” Residual sprays left to dry on surfaces don’t work well against web spiders because the spiders never walk through the residue.
Physical Removal Is the Easiest Option
Joro spiders love structures. They build their distinctive golden webs on porches, between railings, along rooflines, and between trees near homes. A broom, long stick, or even a garden hose pointed at the web will dislodge them. Once removed, they typically relocate rather than rebuild in the same spot immediately. This is the method most entomologists recommend as a first line of defense because it avoids killing beneficial insects nearby and costs nothing.
For egg sacs, which look like silk-covered masses attached to leaves, bark, or the side of your house, you can scrape them off and dispose of them in a sealed bag. Each egg sac can contain several hundred to over 1,000 eggs, so removing them before they hatch in April and May prevents a new generation from establishing in that spot.
Sprays That Actually Work
Testing by the University of Georgia found that not all sprays are equal against Joro spiders. Here’s what the data showed:
- Aerosol spider killers: Products like Black Flag Spider and Scorpion Killer achieved 100% kill rates when sprayed directly on the spiders. These contain synthetic pyrethroids, a class of insecticide common in off-the-shelf pest sprays.
- Essential oil-based sprays: Zevo Spider and Wasp spray, which uses geraniol and cinnamon oil instead of synthetic chemicals, was nearly as effective at over 97% mortality.
- Insecticidal soap: Commercial insecticidal soaps in manual spray bottles hit above 80% effectiveness, making them a reasonable lower-toxicity option.
- Pre-mixed pyrethroid sprays: Garden-ready sprays like Sevin brand also reached above 80% mortality when applied directly.
The critical detail: all of these only work when sprayed directly onto the spider. Once pyrethroid sprays dry on a wall, leaf, or railing, they become largely useless against Joro spiders. Web-building spiders sit in their webs rather than walking across treated surfaces, so they never contact the dried residue. Spraying your whole house perimeter as a preventive barrier won’t do much.
Skip the DIY Concoctions
A diluted dish soap spray is a popular internet suggestion, but it performs poorly. UGA testing found that a 1% Dawn dishwashing soap solution in water killed only about 40% of Joro spiders. That’s essentially a coin flip. Commercial insecticidal soap is a different product, formulated with potassium salts of fatty acids at concentrations designed to break down an insect’s outer coating, and it performs roughly twice as well.
Clemson University researchers tested a range of household products people recommend online, including rubbing alcohol, window cleaner, bleach, hairspray, vinegar, and WD-40. While some did kill the spiders, entomologists strongly discourage using them. These products aren’t labeled as insecticides, which makes using them as such technically illegal. More practically, spraying machine lubricant or bleach around areas where children or pets play creates unnecessary chemical exposure. If you’re going to spray something, use a product actually designed for the job.
When Joro Spiders Show Up
Understanding the Joro spider’s life cycle helps you time your removal efforts. Females deposit eggs in the fall, wrapping them in silk and attaching them to leaves, bark, or the sides of buildings. The spiders spend winter in the egg stage, then hatch during April and May. Through the summer, the spiderlings are small and largely unnoticed. They begin to mature in August and September, and by mid-August the females are large and recognizable, with their bright yellow, blue, and red markings and webs that can stretch several feet across.
The peak nuisance period runs from late August through November, when the adult females are at full size and spinning their largest webs. They die off after the first hard frosts, but their egg sacs remain behind to start the cycle again. If you want to reduce next year’s population around your home, fall is the time to remove egg sacs before winter sets in.
Should You Bother Killing Them?
Joro spiders are an invasive species originally from East Asia, and early coverage sometimes framed them as beneficial because they eat brown marmorated stink bugs, another invasive pest. That framing is misleading. Joro spiders are indiscriminate predators. They eat whatever lands in their web, whether that’s a stink bug or a native pollinator like a monarch butterfly. Research from Clemson University has found that where Joro spider populations are dense, native spider species disappear. They are displacing the spiders that were already doing the same pest-control job.
That said, individual homeowners aren’t going to eradicate an invasive species that’s spreading across the southeastern United States. The practical approach is targeted removal where the spiders are a direct nuisance: on your porch, blocking walkways, covering your mailbox, or near outdoor seating areas. In the far corners of your yard or garden, removing them is optional. Broad pesticide application is generally counterproductive because it kills beneficial insects along with the Joro spiders.
Keeping Them Off Your Home
Joro spiders build webs between anchor points: porch columns, railings, tree branches near the house, gutters, and light fixtures. Reducing these anchor points helps. Trim branches that extend close to your home’s exterior, and keep shrubs from touching walls or railings. Outdoor lights attract the insects that Joro spiders feed on, so switching to yellow or warm-toned bulbs that attract fewer bugs can make your home less appealing as a web site.
Consistent physical removal during the summer months, before the spiders reach full size, is the most effective long-term prevention. Knocking down small webs every week or two discourages the spiders from reestablishing in that location. Pair that with egg sac removal in fall and winter, and you can keep the population around your home manageable without chemicals. For spiders in hard-to-reach spots, a targeted spray of insecticidal soap or a labeled aerosol spider killer handles what a broom can’t reach.