Weed killers are a contact killer, meaning they absorb the chemical through what comes in contact with the leaf surface and then translocates the solution throughout the plant through the plant's metabolism. Since weed killers are dependent on contact, it is very important to get good contact with the weed.
Granular weed killers should be applied when grass is damp and should not be watered for 48 hours after application. The dampness of the grass ensures the granular weed killer will "stick" to the leaf. Water applied too soon after application can wash off the weed killer from the surface of the weed before it can be absorbed.
To get good contact with the weed, don't mow the grass before you decide to apply weed killers. This eliminates leaf area, which in turn decreases your leaf area and ultimately decreases your success of the weed killer. When mowing your grass, plan to leave your grass uncut for two days after application and five days before.
During drought conditions or if you are having trouble getting adequate control, add spreader sticker which will increase the surface tension of the leaf to ensure proper absorption of the weed killer. During stress periods, plants tend to be more defensive and at times the addition of spreader sticker can be beneficial.
Weed killers will not prevent any future weed emergence. There is no persistence of the weed killer in the soil, unlike crabgrass preventer which will last several weeks.
You have enough to do, let us make sure we take of your greenscape worries and make them vanish like a passing storm.
Presented by:
Greens Keeper Landscape Maintenance, LLC
623-848-8277
http://www.commerciallandscapecare.com
greenskeeperllc@cox.net
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