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Oryzalin Pre Emergent Herbicide

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Oryzalin Pre Emergent Herbicide from Quali-Pro, compare to Surflan or Prodiamine, is for long lasting pre emergent weed control in warm season grasses. Oryzalin is a cost effective chemical when compared to the alternatives. Oryzalin is orange is color and may cause temporary discoloration of sprayed surfaces.

Target Pests

Oryzalin Pre Emergetn Herbicide controls crabgrass chickweed henbit purslane johnsongrass panicum spurge sowthistle and many other weeds in southern grasses.

For Use In

Oryzalin 4 is intended for use on landscape ornamentals bulbs christmas tree plantations warm season grasses and vineyards.


Soil Preparation Alligare Oryzalin 4 controls weeds growing from seed. Alligare Oryzalin 4 will not control emerged weeds. Therefore, areas to be treated should be free of emerged weeds. Weed residues, pruning, and trash should be thoroughly mixed into the soil or removed prior to treatment. In field applications, the soil should be in good tilth and free of clods at the time of application.

Ground Application Apply Alligare Oryzalin 4 as a directed spray to the soil surface or over the top of plants. Use only a properly calibrated, low-pressure, herbicide sprayer that will apply the spray uniformly. Use screens no finer than 50 mesh in nozzles and in-line strainers. Apply the appropriate rate of Alligare Oryzalin 4 as specified on this label. In all cases, use sufficient water volume to obtain uniform coverage and deliver the desired rate of Alligare Oryzalin 4 to the treated area. The volume of water used is not critical as long as the desired rate of Alligare Oryzalin 4 is delivered uniformly across the area treated. When calibrating, determine the volume of water delivered by the sprayer to a given area (100 Sq ft, 1 acre, etc.). Then mix the desired rate of Alligare Oryzalin 4 in the amount of water required to cover the entire area to be treated. As the amount of water used (spray volume) decreases, the importance of accurate calibration and uniform application increases. Check the sprayer daily to ensure proper calibration and uniform application. Maintain continuous agitation from mixing through application. Avoid spray pattern skips and overlaps that may result in incomplete coverage or over-application.

Hand Held or Backpack Sprayer Application The amount of water used to apply Alligare Oryzalin 4 herbicide is not critical, but should be sufficient for uniform coverage of the target area. Calibrate by determining the volume of water required to treat 1,000 square feet. Use this calibration volume to determine the amount ofwater and Alligare Oryzalin 4 herbicide needed to treat the target area (see the following calibration example). Note: Sprayer calibration (volume of spray needed to treat 1,000 square feet) will vary with each individual operator.

Alligare Oryzalin 4 may be applied as a preemergence treatment for control of annual grasses and certain broadleaf weeds in established warm season turf including bahiagrass, bermudagrass, buffalograss, centipedegrass, St. Augustinegrass, zoysiagrass, and established tall fescue growing in warm season areas. Established turf is defined as a dense turf having a well-anchored root system and healthy vigorous top growth. Use Alligare Oryzalin 4 only as a part of a total turf management program that includes good fertilization practices. Alligare Oryzalin 4 may be tank mixed with Gallery herbicide and applied preemergence to broaden the spectrum of broadleaf weed control in warm season turf. Refer to the label for Gallery for specific use directions, precautions, and limitations before use. Any cultural practices that disturb the soil, such as aerification or verticutting, should be done prior to application of Alligare Oryzalin 4. Alligare Oryzalin 4 will not control emerged weeds. Successful preemergence control of weeds listed on this label requires that Alligare Oryzalin 4 be applied prior to weed germination and be activated by at least one-half (1/2) inch of rainfall or irrigation within 21 days of application.

Alligare Oryzalin 4 may injure turf that is not well-established or is stressed or weakened due to unfavorable winter climatic conditions, drought, nematodes, or other factors which damage or weaken turf root systems. Apply Alligare Oryzalin 4 only to healthy, well-established turf that has a well-anchored root system.

Summer Annual Grasses and Broadleaf Weeds Single Application Program: Apply 2 quarts per acre of Alligare Oryzalin 4 in late winter or early spring, prior to the onset of conditions favorable for annual weed germination. Split Application Program: As an alternative to a single application program, Alligare Oryzalin 4 may be applied in a split application. This program is desirable when the initial application is made well in advance of weed germination and where weed control is desired for a longer period of time. Apply 1.5 quarts per acre of Alligare Oryzalin 4 in an initial application, followed by a second application of 1.5 quarts per acre 8-10 weeks later. The second treatment of the split application may follow application of a different preemergence grass herbicide in place of the initial application of Alligare Oryzalin 4.

Weed Control in Florida In Florida, apply 1.5 quarts per acre of Alligare Oryzalin 4 three times per year, or every 90 – 100 days in the fall, early spring, and early summer. Do not apply more than 1.5 quarts per acre of Alligare Oryzalin 4 in any single application.

Coverage Area

Each 2.5 Gallon of Oryzalin will treat up to 2.5 acres of turf grasses and ornamentals.

Time to Kill

This product prevents weeds from growing. It will not kill weeds past the germination stage.

Country of Manufacture

United States

Mix Rate

Mix 3oz of Oryzalin per gallon of water to treat 1,000 square feet.

Active Ingredient

Oryzalin 41%

Oryzalin Pre Emergent Herbicide

Product Q & A

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Browse 9 questions Browse 9 questions and 12 answers
What's the strength? Is this a 40% concentrate?
Bob on Jan 8, 2017
BEST ANSWER: Oryzalin Pre Emergent Herbicide is a 41% Concentration, we also have the WSB, which are pre-measured dissoluble packs.


Will this kill goat heads or sand burs?
Jamie G on Oct 13, 2017
BEST ANSWER: It will prevent them from germinating, apply in the fall and the spring, before weeds start germinating.
Is this product recommended for controlling/eliminating bermuda grass in a fescue lawn in Tennessee?
Sue S on Jun 30, 2018
BEST ANSWER: This product is a pre-emergent for control of mainly broadleaf (some other non-broadleaf are controlled) weeds in both Bermuda & Fescue lawns. Bermuda grass is unaffected as both it and Fescue are the host grasses and NOT the targeted weed.
I've found the best way to choke out Bermuda in Fescue is to over seed (heavily) with Fescue in the fall and then again in the spring. There is not a herbicide that can be used on Bermuda without killing the Fescue since they are both ornamental lawn grasses.
I am in zone 8 with bermuda. Would a good plan to be spray in early November to control winter weeds and spray again in early February to control spring weeds? thanks
A shopper on Oct 4, 2017
BEST ANSWER: I also live in zone 8 with bermuda. I actually apply preemergent at the beginning of September, end of October, and again at the end of January with roundup. I base this on the fact that I previously had a lawn service that applied preemergent at these times.
What is the storage life Oryzalin?
Tommy on Mar 4, 2018
BEST ANSWER: You can store Oryzalin Pro for up to 3 years.
Can I use this in a pasture with horses?
Doug V on Feb 17, 2018
Do not graze or feed forage from treated areas to livestock.

This is not labeled for use in areas with livestock and grazing occurs.
Can I spray this pre emerg in the summer with MSMA or is fall/spring the only time to use it? I am in zone 8 with bermuda. thanks!
Matt on Jun 10, 2017
BEST ANSWER: The next best time to apply this will be from August to October for that zone.
Can this be applied through a hose end sprayer? If so, what setting? This is the only practical way to apply on a large, steep hillside. Okay to apply over jasmine vines and cypress shrubs?
Carolyn on Mar 22, 2017
BEST ANSWER: Yes, the Oryzalin can be applied with a hose end sprayer, and it is fine to apply to jasmine and other bedding plants.
I'm in Indiana I have kentucy blue grass and fescue I believe. will hurt my lawn
Chris on Jan 26, 2017
BEST ANSWER: Yes it would thin out your winter grass when applied. Annual Grasses Controlled by Quali-Pro Oryzalin 4
Summer Annuals:
Common Name Scientific Name
Barnyardgrass (watergrass) Echinochloa crus-galli
Crabgrass, large Digitaria sanguinalis
Crabgrass, smooth Digitaria ischaemum
Crabgrass Digitaria spp.
Crowfootgrass Dactyloctenium aegyptium
Foxtail, bristlegrass Setaria magna
Foxtail, giant Setaria faberi
Foxtail, green (pigeongrass) Setaria viridis
Foxtail, robust Setaria robusta
Foxtail, yellow Setaria glauca
Goosegrass (silver crabgrass) Eleusine indica
Johnsongrass (seedling only) Sorghum halepense
Ryegrass, Italian Lolium multiflorum
Sandbur, field Cenchrus incertus
Winter Annuals:
Common Name Scientific Name
Bluegrass, annual Poa annua

Customer Reviews

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Good Product
Good Product
August 30, 2016
Surflan for burrgrass control
Haven't used this product yet; waiting for optimal ground temperature (52 degrees). Oryzalin is recommended by Texas A&M for control of burr grass, which bedevils my long haired terrier. We'll see.
February 18, 2013

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