Prime Source Duo Stick Select

4.5 out of 5 stars 34 Reviews | 18 Q&A

Prime Source Duo Stick Select

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Average Rating

4.5 out of 5 stars Rating: 4.7

34 Reviews | 18 Q&A

Product Overview

The Duo Stick Select is specially formulated for use with herbicides and other pesticides that require MSO or MVO. It features a definite, high quality blend of methylated soybean oil (MSO) and organisilicone surfactant (OSS). The oil serves as a major penetrant that supports particular pesticides in shifting through the waxy cuticle of leaves and plants for optimal efficiency. Furthermore, the organisilicone surfactant boosts the distribution and wetting of the applied solution to allow the active move rapidly and directly to the plant. Duo Stick Select is best used to rights of way, forestry site preparation applications, turf and ornamentals, aquatic/submerged, aquatic/surface, and agriculture and citrus.

Features and Specs

Active Ingredient Proprietary blend of methylated seed oil and organosilicone surfactants 99.0%
For use in Turf and Ornamentals
Agriculture and citrus
Rights of way and forestry site preparation
Aquatic surface and submerged
Application Fill tank with water to 3/4 of target volume, then add other activators, adjuvants, foaming agents, and actives
Apply Duo Stick at 16 to 48 ounces per 100 gallons of solution
* See label for complete details
Pet safe Yes, if used as directed on Label
Special Features High grade surfactant for use with any herbicide or pesticide non-ionic surfactant
Shipping Weight 2.04 lbs
Manufacturer Prime Source



Duo Stick Select is designed for use with herbicides and may be used when the pesticide label calls for an MVO or MSO, but does not exclude the use of an organosilicone.

As with all spray applications, be certain the mix tank and spray equipment is clean and free from previous spray solution residues.

Always follow the pesticide label instructions for mixing and use. If no mixing instructions are available, add tank mix partners in the following order, maintaining agitation throughout the mixing process:

  • Water to 3/4 of target volume
  • AMS, fertilizers and micronutrients
  • If foaming is anticipated, add antifoaming agent
  • Water soluble actives (dry flowables, granules, etc.)
  • Flowable and water soluble actives
  • Water to desired target volume

See Product Label for specific use rates.

5 stars   29
4 stars   3
3 stars   1
2 stars   0
1 star   1
Review Search   
Sort Reviews
  • 5 of 5 Stars

    Great Surfactant

    By David on 09/14/2016

    I added this to Drive XLR8 and the crabgrass started to die in 2 days, very effective product.

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    28 of 29 people found this review helpful

  • 5 of 5 Stars

    It helps a lot when using Herbicide.

    By Keith on 09/14/2018

    I have tried this product with Herbicides and I feel that it makes a big difference. I use a dilution rate of 1/2 ounce per gallon duo stick. You can make a lot of gallons with this one bottle. I have tried not using this product and the results were not as good. If you're going to spend the money on a good herbicide duo stick is small change

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    21 of 21 people found this review helpful

  • 5 of 5 Stars

    Can't say for sure

    By Anthony on 09/28/2018

    I have never used the product I purchased to go along with this by itself or at all to compare the effectiveness of this partnering product. I do know I wanted my crabgrass dead and the combination of this plus the quinclorac made that happen.

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    17 of 17 people found this review helpful

  • 5 of 5 Stars


    By Jeff on 09/07/2016

    This stuff works great I needed a sticker that will work with my chemicals and not seperate This stuff seems to bind it all together

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    14 of 15 people found this review helpful

  • 5 of 5 Stars

    Methylated seed oil

    By Muldune on 08/06/2015

    Contains methylated seed oil recommended for combination with many grass weed control products.

    Was this review helpful to you?  YesNo

    12 of 12 people found this review helpful

See all 34 customer reviews

Questions & Answers

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Sort Questions
How much MSO (methylated seed oil) to use with one gallon of Drive XLR8 Herbicide?

Tall fescue/ crabgrass control


You will use 0.16 - 0.48 fl. oz. of Duo Stick Select per gallon of water. 

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55 of 66 people found this answer helpful

Why should I use Prime Source Duo Stick surfactant instead of dish soap?

Can't I just use some dish detergent with my herbicide instead of buying this?


Many professional herbicides will recommend using a non-ionic surfactant such as Prime Source Duo Stick to increase the efficacy of the herbicide. You will see this primarily on post-emergent herbicides (some herbicides, like many RoundUp products, already contain a surfactant). Besides not being labeled for use as a surfactant or spreader sticker, even a small amount of dish soap would cause foaming in your spray equipment, which would interfere with your spraying and possibly cause the need for extensive cleaning of your equipment. Results from dish soap as a surfactant would be inconsistent, possibly causing you to waste product (and the time you took to apply it) with limited results. Dish detergents may also cause increased phytotoxicity (burning or other damage) to desirable plants, especially during the hot summer months when post-emergent herbicides are often used.

Prime Source Duo Stick is a high quality methylated seed oil (MSO) and organisilicone surfactant (OSS) that strips the waxy cuticle of plant leaves for better pesticide absorption while offering excellent spreading and coverage of your herbicide. MSO surfactants are used most frequently with herbicides containing quinclorac, such as Drive XLR8.

We sell many other surfactants that can be used with herbicides and pesticides as well. PS 804 Select is a 4-way surfactant that also contains an acidifier and a disposition aid to reduce drift. It also improves penetration of herbicides into the substrate of target plants. We are happy to answer any question you may have about what surfactant may be right for your needs.

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23 of 25 people found this answer helpful

How much Prime Source Duo Stick should I use per gallon of water?

Mixing with Drive XLR8


The Prime Source Duo Stick can be diluted at a 0.16- 0.48 fl oz per gallon of water. Please reference back to the product label for application instructions. 

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14 of 19 people found this answer helpful

Will Prime Source Duo Stick work with Drive XLR8?


The manufacturer recommends using Dyneamic surfactant with Drive XLR8.  Prime Source Duo Stick is a generic version of the product and could also be used.  

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12 of 13 people found this answer helpful

Can Prime Source Duo Stick be used with Prosedge or Sedgehammer?

Prime Source Duo Stick can be combined with Prosedge or Sedgehammer. 

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4 of 5 people found this answer helpful

See all 18 customer questions

Prime Source Duo Stick Select 4.5 out of 5 stars Rating: 4.7 (34 Reviews / 18 Q&A)

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