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dimension weed seed killer

Principle #2: Pre-emergent must be mixed correctly and applied evenly over the target area for best results.

What weeds do you want to control?

If you’re working with a non-irrigated area or a drip zone, apply the pre-emergent just before rain is anticipated.

How Pre-Emergent Herbicide Works

Thorough coverage is key. Think of pre-emergents like a blanket – you need to cover an entire area through which the weed seeds cannot germinate. Spot spraying achieves nothing, as there is plenty of open space for weeds to come through. Manufacturer instructions will indicate how much product to use “per 1000 square feet” or “per acre”, which determines how much herbicide to use for each gallon of water. Note that it usually takes 1 to 2 gallons of spray solution to cover 1000 square feet.

The weed will only be killed when it begins to sprout from the seed and hits the herbicide barrier. It is possible for seeds to remain dormant and not be harmed by the pre-emergent herbicide application. This is why weed control is a constant process. There will always be seeds under the surface and a portion will germinate each season. Annual applications must be made to significantly reduce large infestations.

What desired plants are on the property, and are the herbicides you’re considering safe/labeled for those plants?

To get a better idea of how pre-emergent works, let’s look at 3 key principles of pre-emergent weed control.

Prodiamine – The active ingredient found in the popular Barricade brand pre-emergence herbicide, which tackles about 30 different broadleaf and grassy weeds, including the dreaded crabgrass and annual bluegrass (poa annua).

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If you’re working with a non-irrigated area or a drip zone, apply the pre-emergent just before rain is anticipated.

Is It a Selective or Nonselective Product?

This is a matter of personal preference. Liquid pre-emergent products must be applied with a properly calibrated sprayer. It’s essential to water in granular products applied by a spreader.

Whichever product you select, it’s vital to apply it thoroughly and evenly to gain the best weed prevention. You will need to know how many square feet in your yard to mix the right amount. A pre-emergent must cover your target area completely to serve as a barrier against weed growth. Missing a spot could mean trouble because if you give a weed an inch — it’ll take a yard!

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“The soil temperature should be in the 50-55 degree range,” Grubbs-Bowling says.

Not all herbicides will kill all type of weeds. For example, selective herbicides made to kill broadleaf weeds will not kill the dreaded crabgrass — because it’s a grass.

Second Emergent Applications

Oryzalin – This chemical is used in Surflan and several other brands as a broadleaf weed killer also effective against spurge. In turfgrass, it gained popularity for pre-emergent weed control on established, warm-season turf (including Bahiagrass, Bermudagrass, buffalograss, centipedegrass, St. Augustine grass).

Exactly when your soil turns that temperature will depend on your local climate, and what the weather is like this season. Mid-winter? Early spring? Late spring? Maybe, maybe and maybe.

You can find localized soil temperature readings online or from your county’s Extension Service. For the most localized data of all, plunge a gauge into your own turf. Simple soil temperature gauges can be found online or at garden shops for $8-$15. A meat thermometer with a 3-inch probe will serve the same purpose.