How do I apply Prodiamine 65 WDG?

Our Prodiamine 65 WGD is a professional formulation of Prodiamine pre-emergent and therefore can be mixed in several different concentrations depending on your grass type, approach, and how long you want the application to last.

Prodiamine WDG - 5 lb 

Below are instructions based on our strategy created for DIYers. The label allows for different application amounts based on grass type, please find yours below.

Prodiamine WDG Application Rates

Tall Fescue, Bermuda, St Augustine, Centipede, Zoysia, and Bahia Grasses

• Early Spring as soil temps approach 55ºF
  • .183oz/5.2g per 1,000 sq ft.
• Mid Spring as soil temps cross 65ºF heading to 70ºF
  • .183oz/5.2g per 1,000 sq ft.
• Fall as soil temps fall to 70ºF coming out of summer
  • .46oz/13g per 1,000 sq ft
• Total 
  • .83oz/23.5g per 1,000 sq ft/yr

*These dosages are to be mixed in 1 gallon of water to make a spray mix. This mix should then be evenly applied across 1,000 sq ft of lawn area. Water in with ½” of water within 24 hours.

Kentucky Bluegrass, Ryegrass

• Early Spring as soil temps approach 55ºF
  • .183oz/5.2g per 1,000 sq ft.
• Mid Spring as soil temps cross 65ºF heading to 70ºF
  • .183oz/5.2g per 1,000 sq ft.
• Fall as soil temps fall to 70ºF coming out of summer
  • .183oz/5.2g per 1,000 sq ft.
• Total 
  • .55oz/15.6g per 1,000 sq ft/yr

*These dosages are to be mixed in 1 gallon of water to make a spray mix. This mix should then be evenly applied across 1,000 sq ft of lawn area. Water in with ½” of water within 24 hours.

The reason that the grasses KBG and Rye have fewer “pounds on the ground” yearly than the “warm-season” grasses and turf-type tall fescue are because the label requires it. The label allows more for the grasses that are grown further south and into the transition zone since their seasons are longer.  If your lawn is a mix of KBG, Rye, and Tall Fescue, then you can choose to use the greater application amounts if you think you need them.

Prodiamine Coverages Per Year

Tall Fescue, Bermuda, St Augustine, Centipede, Zoysia and Bahia Grasses

For warm-season grasses and turf-type tall fescue, if you follow the recommendations above, you will utilize .83oz or 23.5g per 1,000 sq ft. per year.

The bottle of prodiamine WDG is 5oz/141.7g which means it will cover 6,000 sq ft for one entire season. (2 spring applications and 1 fall application)

Here is the math:

5/.83=6.02

141.7/23.5=6.02

Kentucky Bluegrass, Ryegrass

For cool-season grasses KBG and ryegrass, if you follow the recommendations above, you will utilize .55oz/15.6g per 1,000 sq ft per year.

The bottle of prodiamine WDG is 5oz/141.7g which means it will cover 9,000 sq ft for one entire season. (2 spring applications and 1 fall application)

Here is the math:

5/.55=9.09

141.7/15.6=9.09

As you can see, we have rounded the math in these cases, but just know if you have Tall Fescue, Bermuda, St Augustine, Centipede, Zoysia, or Bahia you can cover 6,000 sq ft per year with this bottle, and if you have KBG or ryegrass you can cover 9,000 sq ft per year.

Keywords: weed prevention, Prodiamine, pre-emergent, pre emergent, weed control, WDG, 65, WG, crabgrass, liquid