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Dithiopyr 40 WSB Pre Emergent Herbicide

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Dithiopyr 40 WSB (Dimension herbicide) from Quali-Pro is a non staining pre emergent herbicide for the control of grassy weeds in established turf grasses. In an easy to use measured pouches Dithiopyr works well in commercial applications.

Target Pests

Dithiopyr is a pre emergent herbicide to stop weeds from growing. It can also be used to control crabgrass post emergently.

For Use In

Dithiopyr can be used on established grasses including bentgrass bluegrass fescue ryegrass bermuda St. augustine and zoysia. It is important that grasses are fully established before using Dithiopyr.


Apply Quali-Pro Dithiopyr 40 WSB in early spring or summer for best results.

Long grasses should have 7.5oz of Dithiopyr per acre applied for total pre-emergent weed control.

Short length grasses need applications of 15oz of Dithiopyr per acre for pre-emergent control of weeds.

Mix needed rate of Dithiopyr with sufficient water to get even coverage. After application it is necessary to irrigate 1/2 inch of water for best results.

Coverage Area

Each 20oz of Dithiopyr 40 WSB will provide pre-emergent weed control for up to 4 acres.

Time to Kill

This product is for pre emergent control of weeds. It will only prevent weeds from growing not actively kill them.

Active Ingredient

Dithiopyr 40%

Dithiopyr 40 WSB Pre Emergent Herbicide

Product Q & A

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Browse 9 questions Browse 9 questions and 10 answers
Mixing rate per 5oz packs? 5oz to how many gallons of water?
Thank you
Gary on May 9, 2016
BEST ANSWER: https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/Dithiopyr_40_WSB_Label2.pdf

Here is the application label, there are some very specific application recommendations for zones, etc.

What are you trying apply this to and also to control anything in particular?
How much water to mix with pouch?
A shopper on Mar 20, 2018
BEST ANSWER: It will depend on where you are located and what you are trying to control, you can find the packs to acres rate on the label page 5. You will want to use 50 to 100 gallons of water to cover an acre.
Will this kill pop annua?
A shopper on Mar 16, 2018
BEST ANSWER: It will not kill the Poa Annua, but it can stop the germination in the spring and fall months.
Is this product safe to use with chickens?
CWatson on Mar 8, 2018
BEST ANSWER: You would need to keep chickens out of the area until it completely dries.
When is the best time to apply in Northern New Jersey?
John K on Feb 19, 2018
BEST ANSWER: You can find, all application dates for pre-emergent application, fertilizer, etc on this page.


You would want to apply between March and May at the latest for your zone.
Will this kill sand burs & goat heads ?
Marshall G on Jan 27, 2018
BEST ANSWER: Yes, it will prevent Sand Burrs, and Goat Head weed from germinating and reduce or eliminate them in your lawn this spring.

will this product work on sand burs ?
david c on Oct 24, 2017
BEST ANSWER: Yes, the pre-emergent Dithiopyr will work to stop sand burrs from germinating this spring. Make sure to get complete coverage of area.
I bought this product to control weeds in my small lawn (about 2,500 sq ft.) especially dichondra. I tried Spectracide Weed & Lawn but it doesn't kill the dichondra which is why I ordered this product. I noticed on the instructions that controlling dichondra is not mentioned. 1) will it kill it 2) how to mix sprayer for 2,500 sq ft of Bermuda lawn?
A shopper on Oct 5, 2017
BEST ANSWER: No Dithiopyr is a pre-emergent and will stop germination from occurring, but does not work to control.

Here are the recommend post emergent products to kill the Dichondra,


But the DIthiopyr will work as a pre-emergent.
Should this product be watered in and if so, how soon should it be watered in?
Ro P on May 29, 2017
BEST ANSWER: The Dithiopyr 40 WSB is meant to be mixed with water, stands for water soluble bags.

Each 20oz of Dithiopyr 40 WSB will provide pre-emergent weed control for up to 4 acres.

Customer Reviews

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Good product
Work well for my lawn. Goog seller.
May 10, 2013

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