![]() ![]() Remember, when using any pesticide, read the label and follow instructions carefully. The common chemical name for Dimension is dithiopyr and for Barricade is prodiamine. Note that products containing Dimension and Barricade may use the common name rather than the trade name. Lawns established in the fall can be safely treated with Dimension the following spring even if they have not been mowed. However, read the label of the specific product you wish to use to ensure that this use is allowed. But Dimension is kind to young tall fescue, perennial ryegrass, and Kentucky bluegrass seedlings and some formulations can be applied as early as two weeks after the first sign of germination. Normally a preemergence herbicide is not recommended unless the lawn has been mowed two to four times. Dimension is also the best choice if treating a lawn that was planted late last fall. Dimension can kill crabgrass as long as it is young (two- to three-leaf stage). It is the exception to the rule that preemergence herbicides do not kill existing weeds. Though Dimension is usually not applied as early as Barricade, it is the herbicide of choice if it must be applied later than recommended. Because of the added flexibility in timing, these products are favorites of lawn care companies who have many customers to service in the spring. Barricade can even be applied in late fall for crabgrass control the next season.ĭimension can be applied as early as March 1. In fact, they can be applied earlier than April 15 and still have sufficient residual strength to last the season. ![]() Products that do require a follow-up application include pendimethalin (Scotts Halts) and Team (Hi-Yield Crabgrass Control).ĭimension and Barricade are the only two products that give season-long control of crabgrass from a single application. A follow-up application will be needed about 8 weeks later unless you are using Dimension or Barricade. When the trees in your area approach full bloom, apply crabgrass preventer. The Eastern Redbud tree is a good choice for this purpose. Even better, base timing on the bloom of ornamental plants. April 15 is normally a good target date for applying preventer because it gives active ingredients time to evenly disperse in the soil before crabgrass germination starts. See below.)įor most of Kansas, crabgrass typically begins to germinate around May 1 or a little later. Most crabgrass preventers are fairly ineffective after about 60 days, but there is considerable variation among products. If some products are applied too early, they may have lost much of their strength by the time they are needed. Microorganisms and natural processes begin to gradually break them down soon after they are applied. Additionally, preventers do not last forever once applied to the soil. ![]() With few exceptions they have no effect on existing crabgrass plants, so they must be applied before germination. Therefore, they do not prevent germination but prevent emergence.Ĭrabgrass preventers are just that – preventers. They do not kill the seed or even keep the seed from germinating but rather kill the young plant after it germinates. Many people have a somewhat foggy idea of how they work and assume they kill the weed seed. Crabgrass preventers are another name for preemergence herbicides that prevent crabgrass seeds from developing into mature plants. ![]()
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