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Prodiamine 65 WDG Barricade Pre-Emergent Herbicide Review

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Pre-emergent herbicides stop seeds from germinating by suppressing a key enzyme. In the US herbicides are most often used for preventing crabgrass from growing in lawns. They should be applied to lawns either in the Spring or Fall to stop weed seeds from beginning to grow. The beauty of these herbicides is that they don't have any effect on established grass. Apply in the Spring when temperatures reach 65 to 70 degrees Fahrenheit for 4 consecutive days. Apply in the Fall when nighttime low temperatures reach 55 to 60 degrees Fahrenheit for 4 consecutive nights.


  • Generic product is cheaper than Barricade
  • Two acres can be treated with one 5 pound container
  • Ideal for lawns, mulch beds, gravel, and sidewalk cracks
  • 1 1/2 lbs of this product covers 1 acre
  • Works well in sprayer and doesn't clog nozzles
  • Works well mixed with Round-Up


  • Although product was said to be non-staining, it stained the concrete floor in my shop (It eventually wore off)
  • Would prefer to have this product in liquid form
  • Doesn't work on emergent weeds


  • Controls Annual Bluegrass effectively
  • Non-staining
  • Formulation 65% water dispersible granule and 35% inert materials
  • Active ingredient is Prodiamine, and is the generic equivalent of Syngenta Barricade brand 65WG


Prodiamine 65 WDG Barricade Pre-Emergent Herbicide (a generic Barricade) is an excellent product for controlling weeds, especially when it is used as a broadleaf (any plant that has full flat weeds) and grass weed killer. It can be applied in both Autumn and Spring to provide season-long broadleaf and crabgrass weed control. It is also especially useful for controlling Annual Bluegrass without staining.

Prodiamine 65 WDG (Wettable Dispersible Granule) mixes well in the tank with both iron solutions and fertilizers. It has low volatility and solubility and stays within the area of possible weed germination. This product has 1/4 as much active ingredient Prodiamine as other leading pre-emergent herbicides. Besides crabgrass, it is effective in controlling 31 other weeds, including knotweed, henbit, prostate spurge, chickweed (common and mousear), foxtail (annual), annual bluegrass, goosegrass, barnyardgrass, crowfootgrass, cup grass, itchgrass, junglerice, johnsongrass (seedling),kochia, common lambsquarters, lovegrass, pigweed, browntop, Texas, and Fall panicum, common purslane, rescuegrass, Florida Pusley, signalgrass broadleaf, shepherdspurse, Persian speedwell, sprangletop, yellow woodsorrel (from seed), and witchgrass. It is also successful in keeping weeds from growing in St. Augustine, Centipede, Bermudagrass, Bahiagrass, Seashore Paspalum, Kikuyugrass, Zoysiagrass, Kentucky Bluegrass, Buffalograss, Creeping Bentgrass, Perennial Ryegrass, and tall and fine Fescue grasses.

This product may be used on established turfgrasses (except putting greens on golf courses), sod and lawn nurseries, landscape and container ornamentals, wildflower plantings, established perennials, and Christmas tree farms.

Apply this product with a pull behind sprayer. If Prodiamine 65 is applied in Springtime, some people recommend not reseeding until Fall. Other users say that reseeding is possible with either a minimum of two weeks or heavy rain. A low dose of this product requires mixing 1 tablespoon with water adequate for 1,000 square feet. Two tablespoons for 1,000 square feet is a relatively high dose. After application, the yard will turn brown for approximately 2 weeks. After a rain, the lush greenness of your yard will return.

This product is most potent when applied on soil that is clod-free, weed-free, and debris-free (no mulch or leaves). This product won't harm most shrubs, trees, flowers, and vines. Species that are tolerant to over-the-top application of this product include all Fir species, Norway and Japanese maples, Barberrys, Japanese Boxwood, Weeping Bottlebrush, Wild Lilac, False Cypress, Scotch Heather, Citrus species, American and Flowering Dogwood, Pampas Grass, Border and Greenstem Forsythia, English Ivy, Rose of Sharon, American, Chinese, and Japanese Holly, Walnut, Oleander, Sourwood, Avocado, and Magnolia species.

This product can be harmful if it is absorbed through the skin or inhaled. Avoid any contact with eyes, skin, or clothing. Do not breathe product dust. Prolonged or frequent contact with skin can cause some individuals to have allergic reactions. Wear long pants, long-sleeved shirt, and chemical resistant gloves to apply, as well as shoes and socks. Don't apply directly to water because it might be toxic to fish at higher solubility. Don't enter into treated area for at least 12 hours after application. Don't apply aerially, don't use for golf course putting greens, don't use through any kind of irrigation system, and don't blend with any granular material or dry fertilizer.


Eighty-seven percent of online reviewers were extremely satisfied with this product. It was very effective in stopping crabgrass and other similar weeds from germinating. Thirteen percent of reviewers did not have success with this product, but it was most probably because they did not read the directions and applied this product incorrectly.

About the author

Matt Hagens

Hi, I'm Matt the owner of Yard Care Gurus. I love to be outside working on my lawn, planning my next project. I created this website to help people like you find the best products for yard care and great advice. Thanks for stopping by!

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