Winter Weeds in Centipede

That’s the same thing I got at my plant store. They said it was from LSU. Seems like a lot of Atrazine, twice what the label on the bottle says for 1 gallon of water so I was questioning this.

I think the confusion was that both the 8.6 oz and the 4.3 oz were in 1 gallon of water so the concentration seemed way off between the label and the LSU paper. But if it works for you that’s all I need to know. Thanks.

I just sprayed the following on my Centipede this past weekend to combat Poa, Bermuda, and other winter weeds.

Fertilome Weedfree Zone = 1 oz/1000ft2
Simazine (Pre-Emergent)= 1.5 oz/1000ft2
Tenacity (Poa/Short Term Pre-Emergent) = 0.12 oz/1000ft2
Sethoxydim (Bermuda) = 0.6 oz/1000ft2
Seed Oil = 1 oz/gal

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Sethoxydim (Bermuda) = 0.6 oz/1000ft2

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Is this safe to use on St. Augustine?

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I know it can be confusing on the gallons issue, but it doesn’t matter how much water (gallons) you use to dispense the herbicide mixture provided you dispense it all over a 1000 sq ft. Think of the water as a carrier, not a dilutant. Some 1 gallon sprayers can dispense a gallon over 1000 sq ft, some can’t. Depends on your pace while walking and spraying.

That why it is recommended to calibrate your sprayer. Go in Your driveway with your 1 gallon sprayer filled with water only, walk and spray over a 1000 sq ft. If your sprayer empties before you cover 1000 sq ft pick up your pace while walking and spraying. If you have water remaining after spraying over 1000 sq ft then slow your down your pace while spraying. Sounds complicated but it’s not. It doesn’t need to be perfect but you want to be close.

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I have centipede as well and would like to get my weed problems on control.

I understand the calibration stuff you are explaining, but my issue is how do I efficiently spray this cocktail on a weed infested that's over 9,000 sq ft. Also, how do you all accurately measure for 8.6 and 4.3 ounces? Are you using some type of measuring scale?

Is there anything will be more efficient on a larger scale? I previously used the hosed spray on containers than can be purchased at your local Home Depot with less than moderate success.

OK, first these are liquid herbicides so I should have stated the amount is fluid ounces if I failed to do so, so a clear small measuring cup that has fluid oz marking. I think I picked them up at WalMart in the kitchen wares. They sell them at the stores that sell the herbicides.

As a side note some of dry herbicides that are mixed with water, for example MSM Turf, Celsius, Sedgehammer, where the quantity of herbicide needed is very small, like 1/8 teaspoon or even a few grams or fraction of a gram, you can order fractional teaspoons on Amazon and a cheap electronic jewelers scale to weigh it if necessary for 10 to $12 (Amazon).

Spraying, I have a comparable amount of lawn. I purchased a 3 gallon SOLO backpack prayer that can cover 3000 sq ft. Admittedly it’s a pain to spray for full yard coverage, but I’m not super comfortable with the hose end sprayers either.

Now the “good” part, once you start using pre-emergent herbicides you are not going to have a spray 9000 sq ft - you’ll be spot spraying weeds missed by the pre-emergent so a 1 or 2 gallon sprayer will suffice. I also purchased a 2 gallon hand-held SOLO sprayer for that, even if mix a gallon of spray solution. The cheap ones I purchased at the box stores didn’t hold up. I rarely use the 3 gallon sprayer anymore - probably once a year when nutsedge begins to appear over a broad area in my backyard - pre-emergents have no effect on nutsedge.

If you going to be serious about weed control, go ahead and invest in decent sprayers - it will pay for itself in time. Here is a link to SOLO sprayers. LINK. I bought what I wanted from Amazon.

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Where do I purchase the chemicals? How often to spray? Is this cocktail for post emergent use? If so, what's a good pre-emergent chemical (I'd prefer a granule application for this if possible)?

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The post-emergent chemicals for the winter weed cocktail can be purchased at any good hardware store (not the big box stores) that carry lawn and gardening supplies or most independent retail plant nurseries. Mix and spray when you can. Follow up with a second spray in 3 or 4 weeks. If you have weeds that must be sprayed in summer, when temps get into the high 80s use MSM Turf (metsulfuron methyl) - you can purchase on Amazon. You can reuse the winter weed cocktail in the fall if needed, or the MSM Turf. If you have some weeds not being controlled by these chemicals get back with photos and we can try to help you.

The pre-emergent herbicides can be purchased at similar stores, and I’d recommend Dimension (Fertilome is one brand) or Prodiamine (Barricade) granular, but not the product with nitrogen fertilizer incorporated. Get it out soon - we’ve had a warm winter and the LSU Ag Center has recommended putting it out now. Reapply the pre-emergent this fall around mid-September.

Nothing wrong with the fertilizers you are using per se, but Centipede doesn’t require much fertilization. Purchase a 15-0-15 centipede fertilizer (Fertilome) and apply around April 1 at 0.5 pounds of nitrogen per 1,000 sq ft. (= 3.3 lbs of 15-0-15). Apply a second application of 15-0-15 at the same rate around July 1, and no more for the remainder of the year.

Set your mower to cut the centipede at a height of 2 to 2 1/2 inches, don’t scalp it.

I think up your set for the rest of the year.