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Old 01-19-2013, 10:18 AM
LawnsharkMB LawnsharkMB is offline
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Spot spraying with roundup on dormant centipede

Is it safe? I've been told that it is and that it isn't.
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Old 01-19-2013, 10:35 AM
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imow in NC imow in NC is offline
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Hey, I am in Wilmington, NC only a few miles away. What is it you are trying to kill off?
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Old 01-19-2013, 10:42 AM
LawnsharkMB LawnsharkMB is offline
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Quote:
Originally Posted by imow in NC View Post
Hey, I am in Wilmington, NC only a few miles away. What is it you are trying to kill off?
Actually I've already done it. I worked at a golf course for a couple years and we would spray barricade and roundup in the rough (bermuda) starting in mid February. I recently spot sprayed an entire property of centipede with Prosecutor 3oz./Gal. Now I'm reading online that its not safe to spray glyphosate on dormant centipede, st Augustine, or zoysia. Weeds were mainly cudweed, tall fescue, poa, and henbit.

Now I'm worried I will have a bunch of dead grass come spring time.
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Old 01-19-2013, 10:48 AM
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imow in NC imow in NC is offline
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This time of year I am using a mix of Atrazine 4L / Manor / and or southern speedzone. that way i can do a little pre and post at same time.
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Old 01-19-2013, 11:00 AM
LawnsharkMB LawnsharkMB is offline
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Originally Posted by imow in NC View Post
This time of year I am using a mix of Atrazine 4L / Manor / and or southern speedzone. that way i can do a little pre and post at same time.
I'll have to try that. What do you think about the glyphosate on dormant grass?
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Old 01-19-2013, 11:04 AM
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imow in NC imow in NC is offline
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Dormant grasses are not dead grasses. just the leaf material is brown. Roots very much alive. roundup kills to the roots.
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Old 01-19-2013, 12:25 PM
grassmasterswilson grassmasterswilson is online now
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Centipede rarely goes fully dormant like Bermuda here in nc. You may have some dead steaks come green up time but should recover.

I'd never use round up on anything but fully dormant Bermuda.
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Old 01-19-2013, 01:47 PM
Smallaxe Smallaxe is offline
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Gly kills to the roots,,, but I thought it only gets to the roots systemically through the actively growing leaves... When the leaves are dormant and brown there is no longer any translocation from the above ground material to the below ground material...

Plz let us know how your spraying worked out... If it killed the weeds and If it harmed the lawn grass in any way...
This question has been kicked around for years now and nobody seems to have any anecdotal info about it... the Official Info. is strictly CYA...
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Old 01-20-2013, 06:54 AM
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imow in NC imow in NC is offline
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Weed Control
Apply preemergence herbicides to control crabgrass, goosegrass, and foxtail. Apply by the time that dogwoods are in full bloom. Apply postemergence herbicides in May as needed for control of summer annual and perennial broadleaf weeds such as knotweed, spurge, lespedeza, etc. Do not apply until 3 weeks after greenup. Centipedegrass is sensitive to certain herbicides (e.g. 2,4-D), so follow label directions and use with caution. VIA Turf Files at NC state.
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Old 01-20-2013, 10:12 AM
Skipster Skipster is offline
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Centipedegrass is pretty finicky. It is sensitive to different herbicides and sensitive to too much herbicide (think overlaps, etc). It is also sensitive to winter kill and doesn't go fully dormant in most of the US, so I don't like to treat it with anything while it's not fully green. I've even seen half rates of herbicides labeled specifically for centipedegrass do damage when applied when the lawn is off-color. My best advice would be to use this as an opportunity to get the customer to switch to a better turf species.

As for glyphosate, it has no root uptake. It is taken up through translaminar activity, then translocated throughout the plant. I can't stand the misnomer about "kills to the roots." Either it kills or it doesn't. Glyphosate interrupts the shikimic acid pathway, which allows the plant to make different armoatic acids, specifically tyrosine, tryptophan, and phenylalanine.
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