Oryzalin 4 is a professional-grade pre-emergent herbicide formulated by Control Solutions Inc. The active ingredient is oryzalin and it eliminates the seedlings of unwanted annual grasses and broadleaf weeds to prevent them from growing. It is ideal for use on ornamental flower beds or around various types of trees and bushes. Oryzalin 4 provides 2 to 8 months of continuous control keeping targeted plants from emerging and taking over. Oryzalin 4 can be mixed with label approved post-emergent herbicides for complete control.

Tools Needed

Oryzalin 4 can be applied with a hose-end sprayer, a backpack sprayer, a handheld pump sprayer or a skid sprayer. If targeted annual grasses or broadleaf weeds have already grown, a garden tool to remove the weeds is needed.

How to Use

• Step 1: To figure out how much Oryzalin 4 you need, you will need to determine the treatment area. To do this, multiply length x width to get the total square footage to be treated. Oryzalin treatments should be done at a rate of 1.5 to 3 oz. per 1,000 square feet in a gallon of water depending on your desired length of control. We recommend using 3 fl. oz. per 1,000 for 4 to 8-month control. If you have a 2,000 square foot area to be treated, you would need 6 fl. oz. of Oryzalin 4 mixed with 2 gallons of water.
• Step 2: In a sprayer of your choice, add half the amount of water to the spray tank and then add the appropriate rate of Oryzalin 4 based on your calculations. It is also recommended to add a surfactant such as Alligare 90 and Vision Pro Max to serve as a spray pattern indicator. Add these products to the mixed solution at a rate of 0.33 oz. per finished gallon for Alligare 90 and 0.6 oz of Vision Pro Max per gallon.  Fill the tank the rest of the way with water and shake the spray tank to mix well.
• Step 3: Spray the desired areas to wet and follow-up with watering the area at a minimum of 1/2 inch of water within 21 days of the initial application.

Where to Use

Oryzalin 4 can be used on ornamental flower beds or flower pots to control for unwanted broadleaf weeds. It is ideal for commercial and residential landscaping with warm-season turfs, such as bahiagrass, Bermuda grass, buffalograss, centipede grass, St. Augustine Grass and zoysiagrass. Oryzalin 4 can be used around various trees, shrubs, ground covers or perennials, flowers, non-bearing fruit and nut trees, non-bearing vineyards, and more. Do not use Oryzalin 4 around a nursery, forest or Christmas trees, seedling beds, cutting beds, or transplant beds. Do not apply Oryzalin 4 to pastures used for grazing and do not feed treated hay to livestock.

When to Use

Oryzalin 4 is best applied before unwanted annual grasses or broadleaf weeds have grown. Remove any unwanted grasses or weeds before making an application with Oryzalin 4.

Safety Information

Oryzalin 4 is safe to use around children and pets when applied according to the product label. Always wear the proper personal protective equipment (PPE) when mixing or applying Oryzalin 4.

Special Considerations

Remove or till up all unwanted weeds that have sprouted or that are fully grown. Oryzalin 4 will not kill post-emergent weeds. It is safe to use around established trees, flowers, plants, and other vegetation that are listed on the product label. Before applying, read the label to make sure the non-targeted vegetation is on this list.