Monterey Sucker-Stopper RTU

Monterey Sucker-Stopper RTU, manufactured by Monterey, is a simple growth regulator spray specially designed to inhibit the growth of suckers and sprouts on fruit trees and woody plants.

The active ingredient, Ethyl 1-naphthaleneacetate, is a proven plant growth regulator that targets sucker growth at its source. Unlike mechanical removal, which often stimulates more growth, Monterey Sucker-Stopper RTU stops the problem at the cellular level.

Monterey Sucker-Stopper RTU is a convenient ready-to-use growth regulator that provides consistent regrowth inhibition without affecting the growth of the main plant. This product delivers a dependable and cost-effective drop of suckers and sprouts, resulting in a clean, well-groomed landscape.

Tools Needed

No additional tools are needed. 

How to Use 

• Step 1: Inspect your plant for sucker growth, which typically emerges from the base of the trunk, roots, or lower branches. Ensure the foliage is healthy and free from severe pest or disease issues before application. Shake the bottle thoroughly before use. The maximum single application for ornamental woody plants is 3 fl. oz. of product per 1,000 sq. ft. The maximum annual application for ornamental woody plants is 9 fl. oz. of product per 1,000 sq. ft. The maximum single application for olives is 9 fl. oz. of product per 1,000 sq. ft. The maximum annual application for olives is 9 fl. oz. of product per 1,000 sq. ft.
• Step 2: Prune off existing sprouts or suckers and allow new sprouts to regrow. 
• Step 3: Thoroughly cover area where existing sprouts were removed, but restrict treatment to the cut surfaces and 2 to 3 inches of the surrounding area. To control sprouts in the vicinity of pruning cuts, treat several inches of bark around the cut. Avoid fine spray particles from drifting or splashing on surrounding fruiting wood, buds, or other parts of the tree.
• Step 4: The minimum retreatment interval is 5 days for olives. The minimum retreatment interval is 5 days for woody ornamental plants.

Where to Use

Monterey Sucker-Stopper RTU can be used on suckers and sprouts on residential apples, olives, pears, non-bearing citrus, and ornamental woody plants.

Do not allow this product to contact buds or foliage as injury may result. 

When to Use

Apply when plants are shown established growth.

On bearing trees do not treat suckers during bud swell, bloom or fruit set. This period is from the start of growth to 4 weeks after petal fall. Application during this time can result in excessive thinning. 

After proper pruning, allow new sprouts to regrow and apply Monterey Sucker-Stopper RTU when sprouts are no more than 10 inches tall. It is effective on many ornamental, flowering, and shade trees.

Do not treat weak trees and do not repeat applications on the same tree for at least one year.

Safety Information

Monterey Sucker-Stopper RTU 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 handling and applying this product.

Do not allow people or pets to enter the treated area until sprays have dried.

Special Considerations 

Do not apply this product to trees less than one year old as injury and stand loss will occur. Do not treat any tree that is not vigorous, healthy, and free from stress.