Prodiamine 65 WDG (Generic Barricade)

Prodiamine 65 WDG is a professional-grade pre-emergent herbicide containing 65% prodiamine. It creates a weed-control barrier in the soil that prevents susceptible weed seeds from successfully developing after germination.

• Best for: Preventing annual grassy and broadleaf weeds before they emerge
• Common targets: Crabgrass, annual bluegrass (Poa annua), goosegrass, spurge, chickweed, henbit, foxtails, and more
• Formulation: Water-dispersible granule (WDG) that is mixed with water and sprayed
• Application seasons: Spring and fall
• Where to use: Established lawns and other labeled sites
• Important: Prodiamine is primarily a weed preventer, not a treatment for established weeds.

Always follow the Prodiamine 65 WDG label for application rates, approved turf types, target weeds, and annual application limits.

 

When is the best time of year to apply Prodiamine 65 WDG?

For most lawns, the best time to apply Prodiamine pre-emergent is spring and fall, before target weeds germinate.

Spring application: Apply before summer annual weeds such as crabgrass and spurge begin germinating. A common guideline is to make the application before soil temperatures consistently reach approximately 55°F.

Fall application: Apply before winter annual weeds such as annual bluegrass (Poa annua), chickweed, and henbit begin germinating as soil temperatures cool.

For the best results:

• Apply before weed germination, not after weeds are already established.
• Base timing on soil temperature and local growing conditions, rather than a specific calendar date.
• Apply early enough to establish the pre-emergent barrier before germination begins.
• Follow the product label for rates and application intervals.

Because soil temperatures vary by region and weather conditions, spring and fall application dates can differ significantly from one location to another.

 

Is Prodiamine a good pre-emergent for Bermudagrass?

Yes. Prodiamine 65 WDG is labeled for use on established Bermudagrass and is a popular option for preventing crabgrass and other annual weeds in Bermuda lawns.

Prodiamine can be especially useful in Bermudagrass because it provides:

• Spring pre-emergent control of crabgrass, spurge, goosegrass, and other summer annual weeds
• Fall pre-emergent control of Poa annua and other winter annual weeds
• Long-lasting residual weed prevention when applied at the appropriate labeled rate

If you are looking for the best pre-emergent for Bermuda grass, Prodiamine is a strong option when the weeds you need to prevent are listed on the label.

 

What grass types can Prodiamine 65 WDG be used on?

Prodiamine 65 WDG is labeled for use on many common established warm-season and cool-season turfgrasses, including:

• Bermudagrass
• Bahiagrass
• Centipedegrass
• St. Augustinegrass
• Zoysiagrass
• Kikuyugrass
• Seashore Paspalum
• Buffalograss
• Tall Fescue, including turf-type tall fescue
• Fine Fescue
• Kentucky Bluegrass
• Perennial Ryegrass
• Creeping Bentgrass maintained at 0.5 inch or taller

Application rates and restrictions can vary by turf species. Refer to the Prodiamine 65 WDG label before treating your lawn.

 

What weeds does Prodiamine prevent?

Prodiamine 65 WDG provides pre-emergent control of many annual grassy and broadleaf weeds, including:

• Crabgrass, including large and smooth crabgrass
• Annual bluegrass (Poa annua)
• Goosegrass
• Annual foxtails
• Barnyardgrass
• Spurge
• Chickweed
• Henbit
• Knotweed
• Pigweed
• Purslane
• Lambsquarters
• Witchgrass
• Yellow woodsorrel from seed
• Seedling Johnsongrass
• Florida pusley
• Persian speedwell

For the complete list of controlled weeds, consult the current Prodiamine 65 WDG label.

 

Does Prodiamine prevent spurge?

Yes. Prodiamine 65 WDG is labeled as a pre-emergent herbicide for spurge, including prostrate spurge.

For effective spurge pre-emergent control, apply Prodiamine before spurge seeds germinate. A spring pre-emergent application before soil temperatures consistently rise above approximately 55°F can help prevent spurge that typically appears as temperatures warm.

Prodiamine will not provide effective control of mature spurge that has already emerged. Existing weeds generally require an appropriate post-emergent herbicide.

 

Does Prodiamine kill existing weeds?

No. Prodiamine 65 WDG should be used as a pre-emergent weed preventer.

It works by creating a barrier in the upper soil that interferes with the development of susceptible weeds as they germinate. If crabgrass, spurge, Poa annua, or another weed is already established, an appropriate post-emergent herbicide may be needed.

For season-long weed management, Prodiamine can be used for pre-emergent prevention, while a compatible post-emergent herbicide can be used to control weeds that are already growing.

 

Does Prodiamine 65 WDG need to be watered in after application?

Yes. Prodiamine 65 WDG should be watered into the soil after application so the herbicide can form the pre-emergent barrier needed to prevent weeds.

After spraying:

• Water the treated area with approximately 1/2 inch of irrigation or rainfall.
• Watering moves Prodiamine from the turf surface into the upper soil where weed seeds germinate.
• Follow the Prodiamine label for specific watering and application instructions.

Without adequate rainfall or irrigation, the herbicide may not be properly incorporated into the soil and weed prevention can be reduced.

 

What happens if it rains after applying Prodiamine 65 WDG?

Rain after applying Prodiamine can be beneficial because the product needs moisture to move into the soil and activate the pre-emergent barrier.

Approximately 1/2 inch of rainfall or irrigation after application is generally desirable. However, extremely heavy rainfall may cause runoff or move product away from the intended treatment area.

If very heavy rain is forecast, it may be better to apply when you can more reliably control the amount of water used to incorporate the herbicide. Always follow the product label regarding application and watering requirements.

 

How much Prodiamine 65 WDG should I use per 1,000 square feet?

The amount of Prodiamine 65 WDG per 1,000 sq. ft. is more important than the number of gallons of water used to apply it. Water primarily acts as the carrier that distributes the herbicide evenly over the treatment area.

Application rates vary based on turfgrass, target weed, and desired length of control. The product label provides the appropriate rates and maximum annual amounts for each turf species.

For small lawn applications, 1.5 level teaspoons per gallon of water to treat approximately 1,000 sq. ft. is a commonly used mixing guideline. However, you should always calculate the actual amount of Prodiamine needed based on the labeled rate for your turf and treatment goal rather than relying solely on a teaspoons-per-gallon ratio.

 

How do I mix and apply Prodiamine 65 WDG?

Prodiamine 65 WDG is a water-dispersible granule, so it must be mixed with water before spraying.

For an even application:

1. Measure your treatment area in square feet.
2. Determine the correct Prodiamine rate from the product label.
3. Calibrate your sprayer to determine how much water you normally use to cover 1,000 sq. ft.
4. Fill the spray tank approximately 1/4 to 1/2 full with clean water.
5. Add the measured Prodiamine 65 WDG.
6. Agitate or shake the sprayer to disperse the granules.
7. Add the remaining water.
8. Maintain agitation during application and spray the treatment area evenly.
9. Water the application into the soil according to label directions.

Tip: Do not simply add more Prodiamine because your sprayer uses more water. The correct amount of product per unit area is what determines the application rate.