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Water Dispersible Granules

Often viewed as a relatively novel formulation, water dispersible granules is a pesticide formulation which has been around since the 1960s. While there are many different types of formulations available when conducting pest control, there was a demand for customers who preferred to use dry products and thus, the creation of water dispersible granules came to be and has proven to be an excellent method of pesticide alternative to liquid-based formulations.

On this page you will learn about water dispersible granules, how the granules are formulated, and how to properly apply water dispersible granules around your home to treat for pests. You can also browse the best insecticide water dispersible granule formulations we carry at Solutions Pest & Lawn.

What is a water dispersible granule? 

Pesticides can come in many forms one of which can include water dispersible granules. This granule is a formulation where rather than being in liquid form and needing to be sprayed, the pesticide is reduced to a paste and blended with an organic material that will dissolve in water.

In the case of water dispersible granules (which are also referred to as dry flowables), water-dispersible granular formulations are very similar to wettable powder formulations with the difference being that instead of being dust-like, the product is compressed into dust-free, granule-sized particles.

Most WDGs come with a product-specific measuring device, with dry ounce (or pound) increment marks based on product density (weight per unit volume). Because of this and the fact that they readily flow or pour out of their containers, they are easier to measure and cleaner to handle than WPs. Similar to wettable powders, water-dispersible granules need to be mixed with water and applied as a spray suspension. Once in water, the granules break apart into fine particles like powder.

WGs tend to flow easily, which allows them to be poured, rather than scooped out of a package. The ease of dispersion is highly formulation-specific, and well-designed WGs should disperse fairly quickly.

The percentage of the active ingredient in WDGs are high, sometimes being has high as 90% by weight. Water-dispersible granules bind to the soil after exposure to moisture, and function as a limited soil treatment.

WDG uses
Ideal Conditions for Using Water-Dispersible Granules

Water-dispersible granules perform well as herbicides as well as insecticides.

They settle out quickly unless they are constantly agitated to keep them suspended. They can be used for more pest problems and in most types of spray equipment where agitation is possible.


Much like wettable powders, WDGs have excellent residual activity.  This feature provides a faster knock-down of insects and other pests.  When dealing with infestations of spiders,centipedes, millipedes, German cockroaches and other irritating pests, this residual effect really comes in handy when dealing with straggler bugs that were not killed during the initial treatment.


Benefits of Using Water Dispersible Granules


The benefits of a water dispersible granule is very similar to the benefits brought by wettable powders with the exception of one added benefit: reduced exposure risk. WDGs are easier to mix and measure and because they are less dusty, they are less of an inhalation hazard.


Water dispersible granules are also the most economical formulation of pesticides due to the high percentages of active ingredient and the fact that they are lightweight reducing freight and storage costs.

Drawbacks of Water Dispersible Granules?


Though WGs are usually not as dusty than WPs, there can be smaller particles present, sometimes due to attrition (breaking up) of granules during transportation/handling. A well-designed system should be devoid of this problem. WGs usually take more time to fully disperse in water than other formulations, so good mixing practices are important.


WDGs are also difficult to mix in small quantities because of the high concentrations of active ingredients.


Water dispersible granules also require a fair amount of agitation. It very important that you mill the active ingredient to a smaller particle size, as those particles come out of synthesis they can be fairly large, up to a few millimeters in diameter so they would very quickly clog your nozzles and they would also settle out very fast in your spray tank or have very poor suspensibility so you would have to grind the active ingredient by agitation to reduce its particle size. This is also very important because particle size can impact biological efficacy or even safety depending on the active ingredient.


Popular Water Dispersible Granule Products We Have in Stock


Prodiamine 65 WDG (Barricade Herbicide) - Prodiamine 65 WDG is an excellent pre-emergent herbicide that is activated by water. It is easy to use, safe and effective. It provides excellent control for broadleaf and grassy weeds with a long-lasting residual to contain susceptible weeds and prevent new growth from occurring. Same Exact Active as Barricade but for less. Get the same effectiveness and save money doing it.


Quali-Pro TM 85 WDG Fungicide - TM 85 WDG Fungicide by Quali-Pro is designed for the control of listed fungus and diseases on conifers, turf, and golf courses. TM 85 can be used as a broadcast application, soil drench, foliar spray, or plant dip depending on species of plant and target fungus and disease.


Celsius WG Herbicide -  Celsius™ controls weeds at high temperatures, allowing the turf to reach its optimal density during the most favorable time of year for growing warm-season grasses. There is no better weed control than dense and healthy turf. Unlike some other post-emergent herbicides, LCOs can feel confident applying Celsius because it is safe to use year round at high temperatures on St. Augustine and centipede turf without risk, damage, or fear of significant phototoxicity.


Termidor WG Termiticide -  With the unparalleled efficacy of the Termidor brand, Termidor 80 WG Termiticide/Insecticide is highly effective in preventing and/or controlling a variety of subterranean termites. Termidor 80 WG Termiticide/Insecticide is formulated as a dry powder containing 80% active ingredient and is conveniently packaged in water-soluble packages (paks).


How to use Water Dispersible GranulesWDG how to


1. The chemical will either come with a dosing spoon or be in individual use packets. Follow label directions for proper dosage of WDGs and proper application instructions. 

2. Shake the insecticide container well before spraying to agitate the WDG and to make sure it doesn’t settle.


3. Spray around your exterior windows, the eaves of the house and other areas where there are cracks and crevices. If it is a herbicide WDG, apply to the target weeds, spraying evenly.


Browse our selection of water dispersible products below and if you ever need help selecting the best product for you, call us at (800) 479-6583 or contact us at askapro@solutionsstores.com and we can point you in the right direction for whatever situation you may have.

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