Southern Ag Atrazine Weed Killer for St. Augustine Grass is for use in established St. Augustine Grass and Centipede Grass at the rate of 1.1 pint per 4 gallons of water per 2,000 sq. ft. (43,560 sq ft in an acre). There are 8 pints in a gallon concentrate of the product so you would be able to treat approximately 14,500 sq ft per container.
Southern Ag Atrazine Weed Killer for St Augustine Grass is to be mixed with water only. Per the product label: Combinations with other chemicals with the application mixture are not recommended.
We recommend that you use them one week apart to avoid over-stressing your turf. You should apply the Barricade first as it needs to be watered in. Atrazine is a bit different. 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.
Southern Ag Atrazine Weed Killer for St Augustine Grass is not labeled to treat carpetgrass. Unfortunately, we do not have a selective herbicide to kill carpetgrass in another turfgrass. You can use a non-selective herbicide such as RoundUp QuikPro to spot treat the carpetgrass and then reseed or resod as needed in any bare spots.
