How Do I Apply Prodiamine 65 WDG?

Yard Mastery’s Prodiamine 65 WDG is a professional-grade pre-emergent herbicide that can be mixed at various concentrations to suit your specific grass type, lawn care strategy, and desired length of weed prevention. This flexible formulation enables you to tailor your application for optimal results, whether targeting crabgrass, Poa annua, or other common lawn weeds.

Below, you’ll find easy-to-follow instructions and recommended application rates based on our proven DIY lawn care strategy. The official product label also provides a range of application amounts tailored to different grass types. 

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.

Kentucky Bluegrass (KBG) and perennial ryegrass require lower annual application rates of Prodiamine compared to warm-season grasses and turf-type tall fescue. This is because the product label specifies reduced rates for these cool-season grasses. Lawns in southern regions or the transition zone, where warm-season grasses thrive, can use higher application rates due to longer growing seasons.

If your lawn is a blend of Kentucky Bluegrass, ryegrass, and tall fescue, you have the flexibility to use the higher application rates recommended for tall fescue if you feel your lawn needs extra protection.

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

For most warm-season grasses, including Tall Fescue, Bermudagrass, St. Augustine, Centipede, Zoysia, and Bahia, one bottle of Prodiamine 65 WDG covers up to 6,000 square feet per year. If you have Kentucky Bluegrass (KBG) or perennial ryegrass, the same bottle will cover up to 9,000 square feet annually. These coverage estimates are based on recommended application rates for each grass type, making it easy to plan your lawn care routine and ensure effective pre-emergent weed control.

Here is a video where you can watch Allyn apply Prodiamine WDG as well: 

Video link: https://youtu.be/RSM2Qiz0FWg

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Want to know when to put Prodiamine down on your lawn? Download our FREE Yard Mastery app for timing recommendations based on your soil temperatures and geographical location.