Prodiamine 4L Pre-Emergent Herbicide

Prodiamine 4L Herbicide, manufactured by Quali-Pro, is a pre-emergent herbicide that controls many common weeds, including carpetweed, crabgrass, and more.

As a pre-emergent herbicide, it will control the weeds before they emerge but will not kill present weeds that have already appeared. It has an active ingredient of Prodiamine 40.8%, which is ideal for controlling weeds on turfgrasses, sod farms, lawns, Christmas tree farms, and ornamentals. 

Prodiamine 4L Herbicide is an easy-to-mix product that is ideal for year-long season control and ensures that annual or perennial weeds and wildflower plantings are by creating a barrier on the top of the soil for up to 6 months.

Tools Needed:

You can use a pump sprayer, a backpack sprayer, or a hose-end sprayer. For a large-volume application, you can use a spraying rig.

How to Use:

• Step 1: Determine how much Prodiamine 4L Herbicide to use by measuring the square footage of the treatment area. Do this by measuring the length and width of the treatment area in feet, then multiplying them together (length X width = square footage). Depending on the weed you are trying to control and the turf type, the maximum application rate can range from 0.23 oz. to 1.1 fl. oz. per 1,000 sq. ft per calendar year. For large applications with a professional spray rig, the maximum rate can range from 21 lbs. to 48 fl. oz. per acre per calendar year. For example, if you wanted to apply Prodiamine on Bermudagrass and measure a 2,000 sq. ft. area for treatment, the rate is 0.5 to 1.1. fl. oz. per 1000 sq. ft., so you would need to mix 1 to 2 fl. oz. in 2 gallons of water to cover the entire area.
• Step 2: Fill your sprayer halfway with water. Measure the required amount of product and add it to the sprayer. Fill your sprayer with the rest of the water, thoroughly agitate it, and you are ready to apply. The amount of Quali-Pro Prodiamine 4L to use depends upon the length of residual weed control desired (the higher the application rate, the longer the control), the turf species, and the maximum amount that can be applied to the turf species per calendar year.
• Step 3: Apply the Prodiamine solution over the desired area, following the label instructions regarding your application method and the plants being applied to. Applications can vary depending on these factors, so reading the label beforehand is important to understand how to use the product properly.
• Step 4: Reapply as needed, following label instructions regarding your application type. After use, thoroughly clean the sprayer by flushing the system with a detergent.

Where to Use:

Use Prodiamine 4L Herbicide on turfgrasses (excluding golf course putting greens), lawns and sod nurseries ornamentals, and Christmas tree farms.

When to Use:

This product is most commonly used as a soil application over established plants, so it may not be the best option for young plants. Refer to the label for proper application timings, which can vary depending on the climate, targeted weed, and application method.

Safety Information:

Prodiamine 4L Herbicide is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing and applying this product.

Keep people and pets out of the treated area until the product completely dries.

Special Considerations:

Apply Quali-Pro Prodiamine 4L as a single application or in sequential applications to control weeds germinating throughout the year. All applications must be made before target weeds germinate, or it will not be effective. Quali-Pro Prodiamine 4L will not control weeds that have already emerged.