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Monterey Once A Year Insect Control II
Monterey Once A Year Insect Control ll is a reliable systemic insecticide that provides year-long insect protection for outdoor trees and shrubs.
02/01/26
Monterey Once A Year Insect Control ll, manufactured by Monterey, is a easy to apply insecticide that provides internal defense from harmful insects.
This bug killer product absorbs into the tree and shrub roots the move throughout the plant, providing complete protection and elimination from pests like aphids or Japanese beetles.
Monterey Once A Year Insect Control ll is a straightforward and effective insecticide that provides year-long control with just one application.
Tools Needed
Monterey Once A Year Insect Control ll will need to be mixed and applied with a bucket since it is only intended for soil drench applications.
How to Use
- Step 1: For trees with one trunk, measure distance (in inches) around tree trunk at chest height. A flexible tape measure is the recommended tool. This is the number of ounces of Monterey Once A Year Insect Control ll to apply. For shrubs, measure the height of the shrub to the nearest foot. Round any inches down to the nearest foot if less than 6” and up to the nearest foot if greater than 6”. Multiply the number of feet by 3 – this is the number of ounces of this product to apply. Use 1 oz. of Monterey Once A Year Insect Control ll per inch of distance around trunk. For shrubs, apply 3 oz. of product per foot of height.
- Step 2: Fill a bucket or watering can with 1 gallon of water. For trees with circumference greater than 50 inches, use 2 gallons of water. Shake well.
- Step 3: Slowly pour the solution evenly around the tree. For best results, pour as close to the trunk/main stem of the tree/shrub as possible. Fill the bucket with clean water and pour it around the trunk as well.
Where to Use
Monterey Once A Year Insect Control ll can be used for outdoor residential trees and shrubs, including listed fruit and nut trees.
When to Use
Apply Monterey Once A Year Insect Control ll anytime, except when the ground is waterlogged or frozen.
During prolonged dry periods, water the tree/shrub well the night before making an application.
Safety Information
Monterey Once A Year Insect Control ll 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.
Keep people and pets out of treated areas until the sprays have dried.
Special Considerations
Do not apply this product, by any application method, to linden, basswood or other Tilia species.
| Restricted Use | No |
|---|---|
| Shipping Restrictions | CT, DC, MA, MD, ND, VT, WV |
| Availability | Online |
| Signal Word | CAUTION |
| Keith's Pro Tip | "Prune damaged parts of the trees to help increase the overall health and lessen the amount of energy repairing parts of the tree." |
| Time to Kill | Monterey Once A Year Insect Control ll will take one week to control pests. |
| Chemical Type | Insecticide |
| Formulation | Emulsifiable Concentrate (EC) |
| Application Methods | Drench Treatment |
| Product Drawbacks | Monterey Once A Year Insect Control ll application to trees heavily infested may not prevent their eventual loss due to existing pest damage and tree stress. |
| Active Ingredient | Imidacloprid 1.47% |
| Application Equipment | Gloves |
| Mix Rate | Use 1 oz. of Monterey Once A Year Insect Control ll per inch of distance around trunk. For shrubs, apply 3 oz. of product per foot of height. |
| Use Sites | Outdoors |
| Yield | N/A |
| EPA Registration No. | 228-525-54705 |
| Shelf Life | Monterey Once A Year Insect Control ll will last for 3 years when stored in a dry, clean area and avoid excess heat. |
| Children or pets? | No |
| Property Characteristics | Food-Bearing Plants |
| Availability | Online |
| Restricted Use | No |
| Brand | MONTEREY |
| Keith's Pro Tips | "Prune damaged parts of the trees to help increase the overall health and lessen the amount of energy repairing parts of the tree." |
| Product Drawbacks | Monterey Once A Year Insect Control ll application to trees heavily infested may not prevent their eventual loss due to existing pest damage and tree stress. |
| Target Pests | Aphids, Vine Weevil Larvae, Borers, Adult Japanese Beetles, Lacebugs, Leaf Beetles, Leafhoppers, Leafminers, Mealybugs, Pine Tip Moth Larvae, Psyllids, Royal Palm Bugs, Sawfly Larvae, Scales, Thrips, and Whiteflies. |
| Application Equipment | Gloves |
| Application Methods | Drench Treatment |
| Active Ingredient | Imidacloprid 1.47% |
| Product Type | Insecticide |
| Formulation | Emulsifiable Concentrate (EC) |
| Application Rate | Use 1 oz. of Monterey Once A Year Insect Control ll per inch of distance around trunk. For shrubs, apply 3 oz. of product per foot of height. |
| Shelf Life | Monterey Once A Year Insect Control ll will last for 3 years when stored in a dry, clean area and avoid excess heat. |
| Yield | N/A |
| Use Sites | Outdoors |
| Time to Kill | Monterey Once A Year Insect Control ll will take one week to control pests. |
| Incompatible Home Siding | Brick, Hardie Plank, Stone Veneer, Stucco, Wood, Vinyl |
| EPA Registration # | 228-525-54705 |
*Price does not include freight. We guarantee our rate plus shipping will be less than anyone else's price.




