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SYNGENTA
Optigard Flex Liquid Insecticide
Optigard Flex Liquid Insecticide is a non-repellent insecticide that is designed to control ants, cockroaches, termites and a wide range of other pests. Can be used indoors and outdoors by contact and ingestion.
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Optigard Flex Liquid Insecticide product page
Min : 34.99 - Max : 34.99
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Price as of
11/04/25
11/04/25
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Optigard Flex Liquid Insecticide, manufactured by Syngenta, is a versatile broad-spectrum insecticide that is ideal for treating a wide range of insects.
This product contains the active ingredient thiamethoxam and is a non-repellent, liquid insecticide that can affect insects by both contact and ingestion and can be used both indoors and out. Those insects will be dead before they know what hit them.
Use it as a perimeter spray, a crack and crevice treatment or spot treatment and you are sure to get satisfying results.
Tools needed
To treat large areas with Optigard Flex Liquid Insecticide , a backpack sprayer, a hose end sprayer, or a spray rig is recommended. To apply to smaller areas or as a crack and crevice treatment, a pump sprayer is needed.
How to Use
- Step 1: Measure the square footage you will be treating.
- Step 2: Determine your targeted pest to help you decide how you will apply the product, how much you need to apply and where you need to apply it.
- Step 3. Measure out the amount of Optigard Flex Liquid Insecticide you will need and put it in a pump sprayer, foam sprayer machine or use it as a termite trench treatment. The typical rate is 0.27 - 5.41 oz. per 1 - 10 gallons of water but varies depending on the treatment method and target pest.
- Step 4: After the product has been applied, keep people and pets out of the treated area(s) until dry.
Where to Use
Optigard Flex Liquid Insecticide can be used indoors and outdoors in and around many different surface areas depending on the type of insect the product is being used on. For treating roaches and other insects, it can be sprayed on flooring and baseboards. For treating insects found outdoors, it can be sprayed around the perimeter on the lawn, bushes and in flower beds, as a broadcast spray, or be used for spot and crack and crevice treatments.
When to Use
Use Optigard Flex Liquid Insecticide when you have a growing insect infestation inside or outside the home. Optigard flex has a residual of at least 90 days indoors, however if you have a current infestation you are trying to eliminate you can respray after 30 days if needed.
Safety Information
When used as directed, Optigard Flex Liquid Insecticide is safe for humans and pets. Always wear the proper personal protective equipment (PPE) when applying.
Special Considerations
Optigard Flex Liquid Insecticide controls for many different types of insects and before mixing and applying the product, it is important to know which insect(s) is to be targeted.
| Availability | Online |
| Restricted Use | No |
| Shipping Restrictions * = not registered** = restricted use | 8 Ounce: CO**, CT**, MA**, MD**, ME**, NH**, NJ**, NV**, NY*, OR**, RI**, VT**, WA** |
| Brand | SYNGENTA |
| Keith's Pro Tips | "Optigard is a non-repellent insecticide meaning that pests will walk right over it or through it without knowing it is a poison. It's best used as a perimeter spray around a property. Spray a 3 ft wide band around the base of your home and may sure to get points of entry and door and window frames for best results." |
| Product Drawbacks | It is a slow killing insecticide compared to other insecticide that have a quick contact kill. |
| Target Pests | Ants (except Pharoah and Carpenter Ants), Beetles, Boxelder bugs, Carpenter Bees, Cockroaches, Crickets, Earwigs, Firebrats, Lady Beetles, Millipedes, Pillbugs, Silverfish, Sowbugs and Termites. For more target pests please refer to the label. |
| Application Equipment | Backpack Sprayer, Pump Sprayer |
| Application Methods | Crack & Crevice, Spot Treatment, Trench Treatment |
| Active Ingredient | Thiamethoxam 21.6% |
| Product Type | Insecticide |
| Formulation | Suspended Concentrate |
| Application Rate | You will mix 0.27 - 5.41 oz. of Optigard Flex Liquid Insecticide per 1 to 10 gallons of water. For more specific application rates please refer to the label. |
| Shelf Life | Optigard Flex Liquid Insecticide will last for 3 years when stored in original container away from water, food, feed. Keep this product out of reach of children and animals and in a cool dry place. |
| Yield | 8 oz. of Optigard Flex Liquid Insecticide will cover 1,000 sq. ft. |
| Use Sites | Indoors, Outdoors |
| Time to Kill | Optigard Flex Liquid Insecticide eliminates pests within several days. Reapply if insect activity within treated areas is detected 4 or more weeks following treatment. |
| Comparable Products | Flex 10-10 |
| EPA Registration # | 100-1306 |
| Restricted Use | No |
|---|---|
| Shipping Restrictions | CT, NY |
| Availability | Online |
| Signal Word | CAUTION |
| Keith's Pro Tip | "Optigard is a non-repellent insecticide meaning that pests will walk right over it or through it without knowing it is a poison. It's best used as a perimeter spray around a property. Spray a 3 ft wide band around the base of your home and may sure to get points of entry and door and window frames for best results." |
| Target Pests Multi | Ambrosia Beetle, Ants, Aphids, Bark Beetles, Beetles, Boxelder Bugs, Carpenter Bees, Cockroaches, Crickets, Deathwatch Beetles, Drywood Termites, Earwigs, False Powder Post Beetles, Fire Ants, Firebrats, Lady Beetles, Lady Bugs, Mealybugs, Millipedes, Old House Borer Beetle, Pillbugs, Powder Post Beetle, Silverfish, Sowbugs, Subterranean Termites, Termites, Wasps, Whiteflies, Wood Borers, Wood-Infesting Beetles, Yellowjackets |
| Time to Kill | Optigard Flex Liquid Insecticide eliminates pests within several days. Reapply if insect activity within treated areas is detected 4 or more weeks following treatment. |
| Chemical Type | Insecticide |
| Formulation | Suspended Concentrate |
| Application Methods | Crack & Crevice, Spot Treatment, Trench Treatment |
| Product Drawbacks | It is a slow killing insecticide compared to other insecticide that have a quick contact kill. |
| Active Ingredient | Thiamethoxam 21.6% |
| Application Equipment | Backpack Sprayer, Pump Sprayer |
| Mix Rate | You will mix 0.27 - 5.41 oz. of Optigard Flex Liquid Insecticide per 1 to 10 gallons of water. For more specific application rates please refer to the label. |
| Use Sites | Indoors, Outdoors |
| Yield | 8 oz. of Optigard Flex Liquid Insecticide will cover 1,000 sq. ft. |
| EPA Registration No. | 100-1306 |
| Shelf Life | Optigard Flex Liquid Insecticide will last for 3 years when stored in original container away from water, food, feed. Keep this product out of reach of children and animals and in a cool dry place. |
| Comparable Products | Flex 10-10 |
| 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.