Fly paper is a simple, low-cost pest control tool: a strip of paper or ribbon coated in a sticky adhesive that traps flies and other small insects on contact. It uses no electricity, requires no batteries, and in most forms contains no pesticides. It remains one of the most common ways to deal with flies in kitchens, barns, garages, and greenhouses.
How Fly Paper Works
The adhesive coating on fly paper is typically built around rosin, a natural tree resin that creates a persistently tacky surface. Commercial formulations mix rosin with oils (often castor oil) and binding agents like sodium silicate to keep the glue from drying out too quickly. The result is a surface sticky enough to hold an insect that lands on it but not so wet that it drips.
Flies don’t land on the strip because of a powerful lure. Instead, the design exploits natural fly behavior. House flies prefer to rest on narrow, vertical objects, which is why the classic hanging ribbon shape works. Once a few flies are stuck, the strip becomes even more effective: flies tend to land near other flies, so a partially used strip actually outperforms a clean one. Some manufacturers even print small images of flies on their strips for this reason.
Color also plays a role, especially for certain species. Yellow is broadly attractive to many day-flying insects, which is why yellow sticky cards are standard tools for trapping whiteflies, aphids, and fungus gnats in greenhouses and houseplant pots. The classic amber or golden color of hanging fly ribbons serves a similar function, though it’s less targeted than the bright yellow traps designed for smaller pests.
Types of Fly Paper
The two most common forms are hanging ribbons and flat sticky cards. Hanging ribbons are the traditional choice for house flies. You pull a coiled strip out of a small cardboard tube, hang it from a thumbtack or hook, and let it dangle in the air. Flat sticky cards or sheets are more common in gardening. Cut into small squares and placed on sticks in potted plants, yellow sticky cards trap fungus gnat adults as they hover around soil.
A third category looks like fly paper but works differently. Some pest strips are impregnated with an organophosphate insecticide rather than simple glue. These aren’t just sticky traps; they release a chemical vapor that kills insects. The distinction matters for safety reasons, which is covered below.
Which Insects It Catches
Fly paper is effective against house flies, fruit flies, fungus gnats, whiteflies, and winged aphids. It works best against small, lightweight flying insects that land frequently. For fungus gnats specifically, sticky traps catch adults but won’t solve an infestation on their own, since most of the gnat’s life cycle happens as larvae in soil. Trapping adults reduces the nuisance but doesn’t stop new generations from emerging.
Fly paper is less useful for insects that don’t land on surfaces often, like mosquitoes in flight, or for larger pests like wasps that may be strong enough to pull free. It also won’t help with crawling insects unless you’re using a flat glue trap placed in their path.
Safety for People and Pets
Standard fly paper, the kind that’s purely a glue strip, is essentially non-toxic. If a child or pet touches it, the glue may stick to skin or fur, but it poses no significant poisoning risk. The National Capital Poison Center notes that glue-based traps are “typically non-toxic” and recommends simply drinking something to dilute the adhesive if a small amount is accidentally swallowed.
The exception is pest strips containing organophosphate insecticides. These are a completely different product despite looking similar. Organophosphates disrupt the nervous system in insects, but they can do the same in humans and animals. Even small exposures can cause muscle weakness, vomiting, diarrhea, tremors, and in serious cases, seizures. These products carry label instructions limiting their use to spaces occupied by people or animals for only a few hours per day. If you’re buying fly paper for a kitchen, nursery, or room where pets spend time, check the packaging and choose a simple adhesive strip rather than an insecticide-impregnated one.
Historically, the safety picture was much worse. In the 19th century, fly papers were commonly treated with arsenic. Reports of arsenic poisoning from fly paper contact appeared as early as the 1870s, part of a broader pattern of casual arsenic use in household products like wallpaper, candles, and fabrics. Modern adhesive fly paper replaced those formulations entirely.
Where and How to Place Fly Paper
Placement makes a real difference in how many flies you catch. Research on insect traps shows that traps mounted below five feet are significantly more effective than those hung above head height. Flies spend more time at waist level and below, so a ribbon dangling from a low hook or shelf will outperform one tacked to the ceiling. The ceiling placement is mainly useful near open doorways, where a strip mounted 8 to 10 feet up and perpendicular to the door opening can intercept flies entering the space without drawing more insects in from outside.
Avoid placing fly paper in direct sunlight. Sunlight contains the full spectrum of wavelengths that attract insects, so a strip in a sunny window competes with a much stronger light source and catches less. Heat also dries out the adhesive faster. For the same reason, keep strips away from strong drafts or fans, which can blow lightweight insect fragments off dried-out glue and reduce the strip’s useful life.
For houseplants, cut yellow sticky cards into one- to two-inch squares and attach them to wooden skewers pushed into the soil. Position the card just above the plant canopy where fungus gnat adults fly. Replace cards when they’re covered or dried out.
How Long Fly Paper Lasts
Most fly ribbons stay effective for one to three months, depending on conditions. High humidity and moderate temperatures keep the adhesive tacky longer. Dry heat, direct sun, and dust all shorten its life. You’ll know it’s time to replace a strip when it looks dried out, dusty, or completely covered in insects. A strip packed with dead flies also loses its ability to catch new ones simply because there’s no exposed adhesive left.
In high-fly-traffic areas like barns or outdoor kitchens, you may need to swap strips every few weeks. In a low-traffic indoor room, a single strip can last its full lifespan. Keeping a few replacement tubes on hand during warm months saves you a trip to the store when the current strip fills up.