Bifenthrin 7.9% SC is a liquid concentrate that you dilute with water before spraying. The standard mixing rate for most general pest control falls between 0.33 and 1.0 fluid ounce of concentrate per gallon of water, depending on the target pest and severity of infestation. Your specific product label is the definitive guide, so always check it before mixing, but the rates below reflect the common ranges found on bifenthrin 7.9% SC labels.
General Mixing Rates Per Gallon
For routine perimeter treatments around your home’s foundation, doors, and windows, the typical rate is 1 fluid ounce of bifenthrin 7.9% SC per gallon of water. This creates a 0.06% finished solution, which is the concentration most labels recommend for common household pests like ants, spiders, cockroaches, and crickets.
For lighter pest pressure or maintenance spraying, you can use the lower end of the label range, around 0.33 fluid ounces per gallon. For heavy infestations or hard-to-kill pests, the rate goes up to 1.0 fluid ounce per gallon. A single gallon of mixed solution typically covers about 1,000 square feet of surface area when applied as a perimeter or crack-and-crevice spray.
Lawn and Turf Application Rates
Broadcast lawn treatments use a different calculation. Instead of mixing per gallon, you measure by coverage area. The standard rate for turf pests like grubs, chinch bugs, fire ants, and ticks is 0.25 to 0.5 fluid ounces of concentrate per 1,000 square feet. You then dilute that amount in enough water to achieve even coverage across the area, which is usually 1 to 5 gallons of water per 1,000 square feet depending on your sprayer type and nozzle.
For mosquito and tick control in yards, the higher end of the range (0.5 fl oz per 1,000 sq ft) provides longer residual protection. Mole crickets, armyworms, and sod webworms also call for the higher rate.
Step-by-Step Mixing Process
Fill your sprayer tank with about half the total water volume you need. Add the measured amount of bifenthrin 7.9% SC concentrate to the water. Then fill the tank the rest of the way. Close the sprayer and shake or agitate thoroughly to ensure the product disperses evenly. The “SC” stands for suspension concentrate, meaning the active ingredient is suspended in liquid rather than dissolved, so agitation is important to keep the mixture uniform.
If you’re tank-mixing bifenthrin with other products, the recommended order is: add any wettable powders first and agitate, then add liquids and flowables (bifenthrin 7.9% SC falls in this category) and agitate again, then add emulsifiable concentrates last and agitate once more. If the mixture seems incompatible, try reversing the order or adding more water.
Only mix what you plan to use that day. Leftover diluted solution should not be stored long-term in your sprayer, as the suspension can settle and the mixture loses consistency.
Common Pest Rate Reference
- Ants, spiders, roaches, earwigs: 1 fl oz per gallon for perimeter spraying
- Mosquitoes (yard spray): 0.33 to 0.5 fl oz per 1,000 sq ft
- Ticks and fleas (lawn): 0.5 fl oz per 1,000 sq ft
- Fire ants (mound drench): 1 fl oz per gallon, applied at 1 to 2 gallons per mound
- Termite pre-construction soil treatment: 1 fl oz per gallon at 4 gallons per 10 linear feet (check your state regulations, as termite work often requires a licensed applicator)
How Much Concentrate You’ll Need
A quick way to figure your total product needs: measure the linear footage around your home’s foundation. A standard perimeter spray covers a band about 3 feet up the wall and 3 feet out from the base. For a house with a 160-foot perimeter, you’ll use roughly 3 to 4 gallons of mixed solution per treatment, meaning 3 to 4 fluid ounces of concentrate at the 1 oz per gallon rate.
For a 5,000-square-foot lawn at the 0.5 fl oz per 1,000 sq ft rate, you’ll need 2.5 fluid ounces of concentrate total, diluted in 5 to 25 gallons of water depending on your sprayer setup. Hose-end sprayers, pump sprayers, and backpack sprayers each deliver different volumes per square foot, so adjust your water volume accordingly while keeping the concentrate amount per 1,000 sq ft consistent.
Safety and Application Tips
Wear long sleeves, long pants, chemical-resistant gloves, and shoes with socks when mixing and spraying. Eye protection is a good idea during the mixing step, when you’re handling the concentrated product. Avoid breathing spray mist by staying upwind of your spray pattern.
Bifenthrin is highly toxic to fish and aquatic invertebrates, so keep spray drift and runoff away from ponds, streams, storm drains, and any standing water. Do not apply when rain is expected within 24 hours, and avoid spraying on windy days. Keep people and pets off treated surfaces until the spray has dried completely, which usually takes 30 minutes to a few hours depending on temperature and humidity.
How Long the Treatment Lasts
Bifenthrin leaves a long-lasting residue compared to many other insecticides. Indoor applications along baseboards and cracks can remain effective for several months. Outdoor perimeter treatments typically hold up for 30 to 90 days, though rain, irrigation, and direct sunlight break down the residue faster. Most labels allow reapplication every 30 days or as needed for outdoor use. For lawn treatments targeting turf pests, seasonal reapplication (every 2 to 3 months during active pest season) is common.