Bifen IT mixes at 0.33 to 1.0 fluid ounce per gallon of water for most pest control applications. The exact amount depends on what you’re treating, how severe the problem is, and whether you’re spraying indoors, around your home’s perimeter, or across your lawn. The product contains 7.9% bifenthrin, a synthetic insecticide that kills on contact and leaves a residual layer that keeps working after it dries.
Quick Mix Rates by Situation
The simplest way to think about Bifen IT mixing is in three tiers:
- 0.33 oz per gallon: Prevention or light infestations. Good for routine perimeter sprays when you’re not dealing with an active problem.
- 0.5 oz per gallon: General indoor and outdoor use. This is the most common rate for typical pest control around the home.
- 1.0 oz per gallon: Severe infestations or situations where you want longer-lasting residual protection.
Each gallon of mixed solution covers roughly 1,000 square feet, though actual coverage varies depending on the surface you’re spraying and how heavily you apply it.
Perimeter and Indoor Applications
For spraying around your home’s foundation, doorframes, window sills, and along baseboards, use 0.33 to 1.0 oz per gallon of water. Most people doing a standard perimeter treatment use the mid-range rate of 0.5 oz per gallon. You’re aiming for a band about 3 feet up the exterior wall and 3 feet out onto the ground around the foundation.
Indoors, the label calls for 0.5 to 1.0 oz per gallon for residual pest control in buildings. Apply it as a crack-and-crevice or spot treatment rather than broadcasting it across entire rooms. Focus on baseboards, behind appliances, around plumbing entry points, and along window frames where insects travel.
Lawn and Turf Rates
Lawn applications follow the same concentration range (0.18 to 1.0 oz per gallon) but the key number to track is how much product you’re putting down per 1,000 square feet. For most lawn pests like chinch bugs, armyworms, and grubs, the maximum label rate is 1 oz of Bifen IT per 1,000 square feet. If you’re using a backpack sprayer that puts down about a gallon per 1,000 square feet, that works out to 1 oz per gallon.
The lower end of the range (0.18 oz per 1,000 sq ft) is sufficient for lighter pest pressure. If you’re treating preventively in early spring before insect populations build, you can start low and increase the rate if needed on your next application.
Mosquitoes, Ticks, and Fleas
For mosquito control, spray foliage, shaded areas, and resting spots at 0.33 to 1.0 oz per gallon. Mosquitoes rest on the undersides of leaves, in shrubs, and in shaded areas near standing water during the day. Coat these surfaces thoroughly rather than misting the open air.
Tick control follows a similar approach. Target low-growing vegetation, leaf litter along tree lines, and the transitional zone between your lawn and wooded areas.
For fleas, apply Bifen IT as a coarse, low-pressure spot treatment to areas your pets frequent: under bedding, along rugs, and next to furniture. Vacuum thoroughly before treating. Bifen IT provides up to 3 months of flea control, making it one of the longer-lasting applications. Do not apply the mixed solution directly to your pets.
How Long the Residual Lasts
Residual control varies significantly by pest and application rate. For house flies, expect about 1 month of control. For fleas, the product can remain effective for up to 3 months. Outdoor applications break down faster due to UV exposure and rain, so plan on retreating every 30 to 60 days during peak pest season. Indoor applications in protected areas tend to last longer since they’re shielded from weather.
Higher mix rates generally extend the residual. If you’re mixing at the maximum 1.0 oz per gallon, you’ll get noticeably longer protection compared to the 0.33 oz rate.
How to Mix and Apply Safely
Fill your sprayer halfway with water, add the measured amount of Bifen IT, then fill the rest of the way and agitate to mix. The product is a suspended concentrate, so shaking or agitating the sprayer periodically during application keeps it evenly distributed.
When spraying overhead areas or working in poorly ventilated spaces, wear protective clothing, unvented goggles, chemical-resistant gloves, and a respirator. For standard outdoor perimeter work, gloves and long sleeves are the practical minimum.
Keep people and pets off treated surfaces until the spray has completely dried. Indoors, this typically takes 1 to 3 hours depending on ventilation and humidity. Outdoors, direct sunlight can speed drying to under an hour. Remove pets, birds, and cover fish tanks before spraying indoors. Cover or wash any food preparation surfaces in the treatment area before using them again.
Measuring Small Amounts Accurately
A third of an ounce is a small volume to eyeball. Pick up a graduated measuring cylinder or a syringe marked in milliliters from a hardware store or online. One fluid ounce equals roughly 30 mL, so 0.33 oz is about 10 mL and 0.5 oz is about 15 mL. Using a syringe makes it easy to draw out precise amounts directly from the bottle without spilling or over-pouring. Never use kitchen measuring tools that will later contact food.