Quali-Pro Dithiopyr 2EW Pre-Emergent Herbicide

5 out of 5 stars 2 Reviews | 2 Q&A

Quali-Pro Dithiopyr 2EW Pre-Emergent Herbicide

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5 out of 5 stars Rating: 5

2 Reviews | 2 Q&A

Product Overview

Quali-Pro Dithiopyr 2EW is a high-performing professionally formulated herbicide that provides pre-emergent control of grassy and broadleaf weeds such as crabgrass, dallisgrass, foxtail, sandbur, dandelion, oxalis, spurge, and other listed weeds.  It also provides early post-emergent crabgrass control. It is most effective when applied before germination and activated by at least 1/2 inch of rain or irrigation. This product has a low odor and blooms quickly when diluted, even in cold water. Its viscosity remains stable, even in low temperatures. Recommended for use in areas such as established lawns, ornamentals, sports turfs, and commercial sod farms (see label for complete list). Compatible for tank mixing with some liquid fertilizers and other pesticides. 

Features and Specs

Active Ingredient 24% Dithiopyr
Target pests Annual grasses and broadleaf weeds
For use in Lawns, commercial sod farms, ornamental and sports turf
Application Use Dithiopyr 2EW on seeded, sodded, or sprigged lawns, ornamental turfgrass and unimproved turfgrass that are well established. See label for more instructions.
Pet safe Yes, if used as instructed.
NY (Restricted To Licensed Applicators Only)
Dimensions 7.16 x 4.61 x 11.49
Shipping Weight 8.81 lbs
Manufacturer Quali-Pro (Mfg. Number: 83014030)
UPC 810084590034
EPA Registration 53883-500



For Turfgrass: Use Dithiopyr 2EW on seeded, sodded, or sprigged lawns, ornamental turfgrass and unimproved turfgrass that are well-established. Newly established turf must have developed a good root system and a uniform stand, and have received at least two mowings following seeding or sprigging before making the first application of this product. Note precautions below for sodding. Use of this product on turf that is not well- established, or has been weakened by weather, pest, disease, chemical, mechanical or other related stress, may result in turf injury.


  • Dithiopyr 2EW will prevent the germination of annual bluegrass. Dithiopyr 2EW will not affect established annual bluegrass. If maintenance of annual bluegrass is desired, using this product during the time of annual bluegrass germination is not recommended. In the states of AZ, CA, NV, OR, WA, NM, ID, MT and UT, Dithiopyr 2EW may contribute to the thinning or stand reduction in established stands of annual bluegrass.
  • To avoid turfgrass injury, do not apply to newly set sod until the sod has rooted and exposed edges have filled in.
  • For best results, cultural practices that disturb the soil, such as verticutting and core-, spike-, or hydro- aerification, should be done before applying this product.


This product is toxic to fish and highly toxic to other aquatic organisms including oysters and shrimp. Use with care when applying to turf areas adjacent to any body of water. Drift and runoff from treated turf may be hazardous to aquatic organisms in water adjacent to treated areas. Do not apply directly to water, or to areas where surface water is present, or to intertidal areas below the mean high water mark. Do not apply when weather conditions favor drift from treated areas. Do not contaminate water when disposing of equipment washwater or rinsate.


Do not contaminate water, food, or feed by storage and disposal.

Pesticide Storage: Store this product only in its original container in a dry, cool, secured storage area. Store this product above 32°F to avoid crystallization. If crystals form or product freezes, move product to area with ambient temperature above 32°F and shake well until crystals have dissolved.

Pesticide Disposal: Wastes resulting from the use of this product must be disposed of on site or at an approved waste disposal facility.

Container Handling: Nonrefillable container. Do not reuse or refill this container. Offer for recycling if available, or puncture and dispose of in a sanitary landfill, or by incineration, or by other procedures allowed by state and local authorities. Triple rinse or pressure rinse container (or equivalent) promptly after emptying.

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  • 5 of 5 Stars


    By Miller on 03/10/2023

    Excellent product. 2 apps a year and no weeds or crabgrass. Perfect lawn! 1st app needs to be put down when soil temperature is right.

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    1 of 1 people found this review helpful

  • 5 of 5 Stars

    My favorite pre-emergent!

    By Kathryn on 02/23/2024

    DMO always delivers very quickly! Thank you for supplying the options that I need for ranch maintenance.

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Questions & Answers

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What is the coverage for 1 gallon of Quali-Pro Dithiopyr 2EW Pre-Emergent Herbicide?

According to the label, you will 0.73 oz of Quali-Pro Dithiopyr 2EW Pre-Emergent Herbicide per 1000 sq ft or 2 pts per acre.  The gallon will cover up to 4 acres.

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When to use Quali-Pro Dithiopyr 2EW Pre-Emergent Herbicide in Maryland in tall fescue?

Also how to use Defender. Do they need to be applied at different times?


For the best timing on when to apply Quali-Pro Dithiopyr 2EW Pre-Emergent Herbicide  we would recommend contacting your Master Gardener at your local cooperative extension office as they will have information for your specific region. Please be sure to review the product label for more information and complete application instructions before use.  Defender Herbicide is a post emergent herbicide best applied when weeds have just started to emerge and can be applied around the same time if listed weeds are actively growing.

The general rule for spring is to apply your pre-emergent herbicide treatment after the ground has thawed from the winter but before the temperature of your soil reaches 55 degrees, as that is when crabgrass begins to germinate. Other weeds will germinate when the soil temperature is between 55 and 65 degrees. You can use a soil thermometer to determine the temperature of your lawn/area. You will want to measure the temperature of the soil a few inches below ground.

The ideal time to apply a fall pre-emergent herbicide to your yard is between August and November when the soil temperature is below 70 degrees and dropping.


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