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SYNGENTA
Tandem Insecticide
Tandem Insecticide is a microencapsulated insecticide highly regarded for its fast knockdown and residual control against 90 different pests, such as ants and fleas.
As low as
$87.81
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Tandem Insecticide product page
Min : 87.81 - Max : 175.81
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Price as of
09/21/25
09/21/25
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Tandem Insecticide, manufactured by Syngenta, is an impressive microencapsulated insecticide with dual modes of action that control a wide range of indoor and outdoor pests.
This suspended concentrate formulation is incredibly versatile. You can apply it indoors (as crack and crevice treatment) and outdoors (perimeter and broadcast treatment), and it can even be sprayed on ornamentals, protecting your plants from insects for up to five weeks.
Tandem Insecticide combines the power of two proven active ingredients, lambda-cyhalothrin and thiamethoxam, to provide a double assault on pests with one product. Formulated with proprietary iCAP technology, Tandem provides a quick knockdown and long-lasting control of various pests.
Tools Needed
You will need a backpack sprayer, a hand-pump sprayer, or a spray rig.
A surface treatment of Tandem Insecticide may be applied using a paintbrush or other porous applicator attached to a handle.
How to Use
- Step 1: Determine how much Tandem Insecticide to use by measuring the square footage of the treatment site. To do this, measure the length and width of the treatment area in feet, then multiply them together (length X width = square footage). For acreage, divide the square footage by one acre (square footage / 43,560 sq. ft. = acres). To perform spot treatments, use a concentration of 0.065%–0.13% of the active ingredient in final dilution. For a 0.065% concentration, use 16 ml (0.55 fl. oz.) of Tandem Insecticide per gallon of water. For a 0.13% concentration, use 32 ml (1.1 fl. oz.) of product per gallon of water. To perform a perimeter application around structures, apply 0.55 fl. oz. (16 ml) or 1.1 fl oz (32 ml) of product per 1 to 5 gallons of water per 800 to 1,600 sq. ft. Broadcast applications to turfgrass, use 28 fl. oz. of product per 100 gallons of water per acre or make 2 applications of 14 fl. oz. of product per acre on a 3- to 5- week interval. Application to ornamentals will use 8.5 to 13.9 fl. oz. of product per 100 gallons of water or 250 to 410 ml of product per 100 gallons of water.
- Step 2: Fill your sprayer with half the water, add a measured amount of Tandem Insecticide, and pour the remaining half of the water into the spray tank. Close the sprayer lid and shake until the solution is well mixed.
- Step 3: Spray directly on the pest if present and thoroughly wet areas, but do not exceed 2 sq. ft. per spot application. When applying as a continuous band around structures, limit treatment to a band up to 7 ft wide around the structure (or according to state regulations governing commercial pest control) and upwards along the foundation to 3 ft. Delay watering or mowing for 12 to 24 hours after application for optimum control of surface-feeding insect pests.
Where to Use
Tandem Insecticide can be used in, on, and around buildings and structures for the control of listed pests, including on lawns, ornamental trees, and shrubs around residential, institutional, public, commercial, and industrial buildings, and in parks, recreational areas, and athletic fields.
Do not apply to pasture or cropland.
When to Use
This product should be used when pests in or around the structure are infested or need to be kept out via perimeter treatment. Applications can be made monthly, beginning in the spring and continuing until frost.
Do not apply to flowering plants. Only apply after all flower petals have fallen off. Time application during periods when pollinating insects are not present, such as early morning or late evening.
Safety Information
Tandem Insecticide is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing and applying this product.
Do not apply directly to pets.
Keep children and pets off-treated areas following the application until the spray has dried.
Special Considerations
Use caution when treating nests of stinging insects, as Tandem Insecticide does not provide instant knockdown. Protective equipment for the applicator may be required to reduce the risk of insect stings during application.
To reduce the risk of being stung, an extension wand is recommended when applying the liquid or foam to nests. Treat nests in the evening when most insects will be present for best results.
| Availability | Online |
| Restricted Use | No |
| Shipping Restrictions | 64 Ounce: AK, CA, CT, HI, MI, NY, OR, RI, SC, VT, WA 32 Ounce: AK, CA, CT, HI, MI, NY, OR, RI, SC, VT, WA |
| Brand | SYNGENTA |
| Keith's Pro Tips | "Tandem Insecticide gives about 90 days of residual control when applied. If you apply it quarterly, you can get year-round control of pests and keep your home bug-free." |
| Product Drawbacks | Tandem Insecticide is toxic to wildlife, highly toxic to aquatic invertebrates, and extremely toxic to fish. |
| Target Pests | Adelgids, Annual bluegrass weevils, Ants, Aphids, Aphodius, Armyworms, Asiatic Garden Beetle, Azalea caterpillars, Bagworms, Black vine weevils, Bed Bugs, Beetles, Black Turfgrass Ataenius, Bluegrass billbug, Boxelder bugs, Broadmites, Brown MarmoratedStink Bug, Brown soft scale, Budworms, California oakworms, California red scale, Cankerworms, Carpenter Bees, Carpenter Ants, Carpet Beetles, Centipedes, Chinch bugs, Cigarette Beetles, Clover mites, Cluster Flies, Cockroaches, Confused Flour Beetles, Crickets, Cutworms, Drywood Termites, Earwigs, Elm leaf beetles, European Chafer, Fall webworms, Fire Ants, Firebrats, Flea beetles, Fleas, Flies, Grasshoppers, Green June Beetle, Hornets, Hyperodes weevil, Japanese beetles, June Beetle, Kudzu Stink Bug, Lace bugs, Leaf rollers, Leaf skeletonizers, Leaf-feeding caterpillars, Leaf-gall-forming insects, Leafhoppers, Leafminers, Lesser Grain Borers, May Beetle, Mealybugs, Midges, Millipedes, Mole Cricket, Mosquitoes, Multicolored AsianLady Beetle, Northern Masked Chafer, Oleander moth larvae, Oriental Beetle, Pine needle scale, Pine shoot beetles, Pinetip moths, Plant bugs, Psyllids, Red Flour Beetles, Rice Weevils, Root weevils, Saw-toothed GrainBeetles, Sawflies, Scale insects, Silverfish, Sod webworms, Southern Masked Chafer, Sowbugs, Spiders, Spittlebugs, Springtails, Stink Bugs, Striped beetles, Thrips, Ticks, Tip moths, Tussock moth larvae, Wasps, White grubs, Whiteflies, Wood Destroying Borers, Wood Destroying Beetles, and Yellow Jackets. |
| Application Equipment | Backpack Sprayer, Pump Sprayer |
| Application Methods | Broadcast Spray, Spot Treatment |
| Active Ingredient | Thiamethoxam 11.6% Lambda-cyhalothrin 3.5% |
| Product Type | Insecticide |
| Formulation | Microencapsulated |
| Application Rate | To perform spot treatments, use a concentration of 0.065%–0.13% of of active ingredient in final dilution. For a 0.065% concentration, use 16 ml (0.55 fl. oz.) of Tandem Insecticide per gallon of water. For a 0.13% concentration, use 32 ml (1.1 fl oz) of product per gallon of water. To perform a perimeter application around structures, apply 0.55 fl. oz. (16 ml) or 1.1 fl oz (32 ml) of product per 1-5 gallons of water per 800-1,600 sq. ft. Broadcast applications to turfgrass, use 28 fl. oz. of product per 100 gallons of water per acre or make 2 applications of 14 fl. oz. of product per acre on a 3- to 5- week interval. Application to ornamentals will use 8.5-13.9 fl. oz. of product per 100 gallons of water or 250-410 ml of product per 100 gallons of water. |
| Shelf Life | Tandem Insecticide will last up to 3 years when stored away from freezing temperatures, food, and feed. |
| Yield | 32 oz. of Tandem Insecticide will cover 25,600 sq. ft. |
| Use Sites | Indoors, Outdoors |
| Time to Kill | Tandem Insecticide eliminates insects within 7 days of treatment. |
| Comparable Products | Onslaught Insecticide |
| EPA Registration # | 100-1437 |
| Restricted Use | No |
|---|---|
| Shipping Restrictions | AK, CT, HI, MI, NY, OR, RI, SC |
| Availability | Online |
| Signal Word | CAUTION |
| Keith's Pro Tip | "Tandem Insecticide gives about 90 days of residual control when applied. If you apply it quarterly, you can get year-round control of pests and keep your home bug-free." |
| Target Pests Multi | Adelgids, Annual Bluegrass Weevil, Ants, Aphids, Aphodius, Armyworms, Asian Lady Beetle, Asiatic Garden Beetle, Azalea Caterpillar, Bagworms, Bed Bugs, Beetles, Black Turfgrass Ataenius, Black Vine Weevil, Bluegrass_Billbug, Boxelder Bugs, Broad Mites, Brown Soft Scales, Budworms, California Oakworms, California Red Scale, Cankerworms, Carpenter Ants, Carpenter Bees, Centipedes, Chinch Bugs, Cigarette Beetles, Clover Mites, Cluster Flies, Cockroaches, Confused Flour Beetles, Crickets, Cutworms, Drywood Termites, Earwigs, Elm Leaf Beetles, European Chafer, Face Flies, Fall_Webworms, Fire Ants, Firebrats, Flea Beetle, Fleas, Flies, Grain Borers, Grasshoppers, Green June Beetles, Hornets, Hyperodes Weevil, Japanese Beetle, June Beetles, Lace Bugs, Leaf Feeding Caterpillars, Leaf Gall Forming Insects, Leaf Skeletonizers, Leafhoppers, Leafminers, Leafrollers, Mealybugs, Midges, Millipedes, Mole Crickets, Mosquitoes, Northern Masked Chafer, Oleander Moth Larvae, Oriental Beetle, Pine Shoot Beetle, Pine Tip Moth, Plant Bugs, Psyllids, Red Flour Beetles, Rice Weevils, Root Weevils, Saw-Tooth Grain Beetles, Stink Bugs, Thrips, Ticks, Tip Moths, Tussock Moth Larvae, Wasps, White Grubs, Whiteflies, Wood Borers, Wood-Infesting Beetles, Yellow Jackets |
| Time to Kill | Tandem Insecticide eliminates insects within 7 days of treatment. |
| Chemical Type | Insecticide |
| Formulation | Microencapsulated |
| Application Methods | Broadcast Spray, Spot Treatment |
| Product Drawbacks | Tandem Insecticide is toxic to wildlife, highly toxic to aquatic invertebrates, and extremely toxic to fish. |
| Active Ingredient | Thiamethoxam 11.6% Lambda-cyhalothrin 3.5% |
| Application Equipment | Backpack Sprayer, Pump Sprayer |
| Mix Rate | To perform spot treatments, use a concentration of 0.065%–0.13% of of active ingredient in final dilution. For a 0.065% concentration, use 16 ml (0.55 fl. oz.) of Tandem Insecticide per gallon of water. For a 0.13% concentration, use 32 ml (1.1 fl oz) of product per gallon of water. To perform a perimeter application around structures, apply 0.55 fl. oz. (16 ml) or 1.1 fl oz (32 ml) of product per 1-5 gallons of water per 800-1,600 sq. ft. Broadcast applications to turfgrass, use 28 fl. oz. of product per 100 gallons of water per acre or make 2 applications of 14 fl. oz. of product per acre on a 3- to 5- week interval. Application to ornamentals will use 8.5-13.9 fl. oz. of product per 100 gallons of water or 250-410 ml of product per 100 gallons of water. |
| Use Sites | Indoors, Outdoors |
| Yield | 32 oz. of Tandem Insecticide will cover 25,600 sq. ft. |
| EPA Registration No. | 100-1437 |
| Shelf Life | Tandem Insecticide will last up to 3 years when stored away from freezing temperatures, food, and feed. |
| Comparable Products | Onslaught Insecticide |
| Children or pets? | No |
| Property Characteristics | None |
*Price does not include freight. We guarantee our rate plus shipping will be less than anyone else's price.