Southern Ag Atrazine St. Augustine Weed Killer

Southern Ag Atrazine St. Augustine Weed Killer, manufactured by Southern Ag, is an effective selective herbicide concentrate that gives reliable control over emerged and germinating broadleaf weeds in St. Augustine and Centipede lawns.

One of the biggest advantages of this herbicide is its dual-purpose action. It works by killing certain weeds that are already growing and preventing many weed seeds from germinating. This means homeowners are not just reacting to current weeds they are reducing future weed pressure at the same time.

Southern Ag Atrazine St. Augustine Weed Killer is a specialized dual-action herbicide for homeowners who want effective weed control without risking damage to sensitive St. Augustine or Centipede lawns. Its selective, gradual action makes it safer during the growing season, while its residual activity reduces repeat weed pressure over time. When applied correctly and at the right moment, this product delivers dependable, season-long weed control and helps create the thick, green lawn every lawn owner is working toward.

Tools Needed

A backpack sprayer, handheld pump sprayer, or spray rig can be used. 

How to Use

• Step 1: Determine how much Southern Ag Atrazine St. Augustine Weed Killer to use by measuring the square footage of the treatment area. Find the square footage by measuring the treatment area's length and width in feet, then multiply them together (length X width = square footage). For acreage, take the square footage and divide it by one acre (square footage / 43,560 sq. ft. = acres). Apply 5 tsps. of Southern Ag. Atrazine St. Augustine Weed Killer per 1 quart of water per 100 sq. ft. To treat 500 sq. ft., use 4.3 fl. oz. of product with 1 gallon of water. Apply 8.6 fl. oz. of product per 2 gallons of water per 1,000 sq. ft. Use 17.6 fl. oz. of product per 4 gallons of water per 2,000 sq. ft. Do not make more than 2 applications per year. 
• Step 2: Fill the sprayer with half the amount of water, add the proper amount of product, and pour in the remaining half of the water. Close the tank lid and shake well until thoroughly mixed.
• Step 3: Spray the top and bottom of the weed leaves until wet, but not to the point of runoff. Rain or water within 2 or 3 days of application may decrease the effectiveness on emerged weeds. However, for the control of weeds from seeds, rainfall or watering is necessary within 7 to 10 days after treatment.

Where to Use

Southern Ag Atrazine St. Augustine Weed Killer is only for St. Augustinegrass and centipedegrass lawns.

When to Use

This product may be applied during both dormant and growing seasons. Best results are usually obtained when applied in early spring or dormant periods when weeds are small or have not emerged.

Do not apply when temperatures exceed 90 degrees Fahrenheit.

Safety Information

Southern Ag Atrazine St. Augustine Weed Killer is safe for people and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing and applying this product.

Do not allow people or pets to enter the treated area until sprays have dried.

Special Considerations

Do not use over rooting area of trees, ornamentals, vegetables or other desirable plants other than the indicated turfgrasses.

Do not replant treated areas (except with listed Turfgrass) within 12 months after treatment or injury may result. Do not overseed turf areas within 6 months after treatment.