Glyphosphate - application rate advice needed

[Retired and Free]

too much drama and virtue signalling for a simple question, so I deleted it. Thanks to the one guy @npalen that actually answered my question.

have fun girls.

 

[koshari]

your application is a little bit confusing to me as we work in metric here but here goes,

i generally spot spray gysophate 360 here at 15mm per litre for spot spraying as per the label for the more stubborn weeds in thoroughfares and rights of way,

broadspraying there are some good apps based on the Ml per hectare.

Any experience on the amount to apply? I can work out the carrier volume and tractor speed, but it’s not clear from the label how much product to apply.

you need to consider your nozzle flow rates and the boom width, this will give you the volume per min rate, , you generally match your tips with the volume/speed. make a spreadsheet up, its a lot easier with a spreadsheet, heres my sheed for amicide for example,

 

[Retired and Free]

thanks, but that isn’t what Im asking. i am asking about amount of product that should be applied, not how to apply it, that is easy to figure out.

 

[mikester]

thanks, but that isn’t what Im asking. i am asking about amount of product that should be applied, not how to apply it, that is easy to figure out.

If you are mixing a tank at 41% concentration you are probably doing it wrong. Post the manufacturers mixing instructions and your tank size.

Too much is a waste of money and bad for the environment. There is a soil residual when you spray. More passes is more bad.

It seems ironic to me to toxify the environment in order to plant "wild flowers". Kinda like using a harpoon gun to "save the whales".

Use a rototiller to cultivate the grass then seed your wildflower mix. No herbicide required.

 

[Retired and Free]

Not mixing “a tank”, only what is needed.

 

[Spike56]

I am replacing 2400 Sq ft of lawn with a wildflower plot and trying to figure out how much gly is needed to kill the existing turf. I have read the label a dozen times and can’t make sense of it. One section states 2.5 oz for 300 square feet, but then another section indicates 3 qts per acre. It does compute. a 2.5 oz./300 sq feet rate works out to 20 oz for 2400 sq feet (which seems excessive). The 3qts / acre rate is roughly 6oz for 2400 sq feet. I’m applying it with a boom sprayer, if that matters, and using 41% gly.

Any experience on the amount to apply? I can work out the carrier volume and tractor speed, but it’s not clear from the label how much product to apply.

Also, if I miscalculate the carrier volume and have solution left in the tank after the first pass, is it safe to run over it on a second pass after the initial app has dried, or will it track across the lawn and damage non-target turf?

Retired and Free,
Mixing instructions on ALL products can be complicated ! First, I must say, I AM NOT AN EXPERT. Ok, now I can offer any experience I have:
There are (2) things that I always have to determine. First, how much water/solution am I putting out per sq/feet or acre, and secondly, what % of active ingredient for the target. I am going to assume since the area is ONLY 2400 sq/ft, your boom sprayer is a garden type with a mini- boom? If you are using a full size tractor / sprayer, I would say "YIKES, I would use a backpack /hand sprayer for that". I mean that is only about 50 ft x 50 ft ?

The exact calculations really depend on the rate (amount you are spraying) out of your tank. Give this a quick look see:

Instructions for Mixing Glyphosate 41

Instructions for Mixing Glyphosate 41. Glyphosate 41 is the common term used for a 41-percent concentrated solution of glyphosate, a potent herbicide used to kill weeds and grasses. A properly diluted solution of glyphosate kills a wide range of weeds and grasses on contact. It is ideal for...

homeguides.sfgate.com

Hope this helps *some*.

 

[npalen]

Yes, the recommended 2.5 oz/300 sqft is almost four times stronger than the recommended three quarts/acre and doesn't make sense. Just for reference, I used about 45 oz of the 41% in 15 gallons of water to spray 8,000 sqft and it got a very good kill in fescue. Probably could have used a weaker mix.

No harm in going over the desired kill area more than once, but don't track onto desired turf.

 

[Retired and Free]

Yes, the recommended 2.5 oz/300 sqft is almost four times stronger than the recommended three quarts/acre and doesn't make sense. Just for reference, I used about 45 oz of the 41% in 15 gallons of water to spray 8,000 sqft and it got a very good kill in fescue. Probably could have used a weaker mix.

No harm in going over the desired kill area more than once, but don't track onto desired turf.

Thanks, this is exactly the information that I was looking for. I’ll scale back to 10 oz for 2400 sq feet. i could probably go a bit lower.

 

[newbury]

Make sure there is a surfacant in the mix. It may be in the product, but a dash of Dawn detergent may do.

 

[dusty3030]

What kind of grass are you trying to kill?

 

[jaxs]

What kind of grass are you trying to kill?

Elephant in the room,wouldn't you say?

 

[npalen]

Elephant in the room,wouldn't you say?

The idiomatic expression "the elephant in the room" refers to an obvious or controversial problem that no one wants to talk about because they find it uncomfortable or awkward.

Another meaning of the idiom is an essential issue or topic that everyone is aware of. However, nobody wants to discuss or address it because it is sensitive or will result in embarrassment.

 

[dusty3030]

Reason I ask is it's all irrelevant unless you know what it is OP is trying to control. For instance if it's bermuda glyphosate isn't going to be that effective no matter the rate. If it's fescue glyphosate 41% at 2 quarts per acre would work great.

 

[Handloader109]

Reason I ask is it's all irrelevant unless you know what it is OP is trying to control. For instance if it's bermuda glyphosate isn't going to be that effective no matter the rate. If it's fescue glyphosate 41% at 2 quarts per acre would work great.

The elephant matters a lot... I've got a gravel road I'm trying to keep the grass from overtaking entirely. The Bermuda wasn't stunted at all when I sprayed it the other day, the water grass is dead in 4 days. And I used hand sprayer and higher percentage. The grass matters
And it is a bit hypocritical to kill grass to have a wildflower weed patch. Btw, most of the grass will be killed back by the glycophosphate, but it will be back along with weeds the grass tends to keep out. ..

 

[RalphVa]

I am replacing 2400 Sq ft of lawn with a wildflower plot and trying to figure out how much gly is needed to kill the existing turf. I have read the label a dozen times and can’t make sense of it. One section states 2.5 oz for 300 square feet, but then another section indicates 3 qts per acre. It does compute. a 2.5 oz./300 sq feet rate works out to 20 oz for 2400 sq feet (which seems excessive). The 3qts / acre rate is roughly 6oz for 2400 sq feet. I’m applying it with a boom sprayer, if that matters, and using 41% gly.

Any experience on the amount to apply? I can work out the carrier volume and tractor speed, but it’s not clear from the label how much product to apply.

Also, if I miscalculate the carrier volume and have solution left in the tank after the first pass, is it safe to run over it on a second pass after the initial app has dried, or will it track across the lawn and damage non-target turf?

It's not the rate but the concentration. There's been some discussion recently about how to get rid of stilt grass because the time to do it is NOW before it seeds.

One way is to use a very weak solution of glyphosate. I found 0.5% to be that in looking online. To get 0.5% in a gallon spayer, I need to add only 110 ml of 18% concentrate (a gallon is 3781 ml) to 3671 ml of water. One of the commentators said this will kill any grass it gets sprayed on, too. Most of us have fescue and some Kentuchy blue. I've used the premixed stuff which others have mentioned is 2% in the past to kill grass.

Glyphosate isn't safe on sandy soil. Excess gets complexed by clay in clay or loamy soil. The unsafe (to fish if it gets to water from sandy soil) ingredient seems to be the sticker in Roundup. If used on sandy soil or near water, use Rodeo which does not have the sticker.

 

[Tom Best]

I transitioned mine with no herbicide. Not to difficult. Let it grow. Nature did the rest. Turned out good.

 

[jaxs]

The idiomatic expression "the elephant in the room" refers to an obvious or controversial problem that no one wants to talk about because they find it uncomfortable or awkward.

Another meaning of the idiom is an essential issue or topic that everyone is aware of. However, nobody wants to discuss or address it because it is sensitive or will result in embarrassment.

"Language police" fits both your descriptions.

 

[dusty3030]

For Bermuda try Fusilade. It doesn’t work fast on it but works. Beauty of it you can spray now and again over the top in the spring when the rhizomes sprig back out and not harm your broadleafs you planted in the fall

 

[npalen]

"Language police" fits both your descriptions.

Haha! I've never quite understood the meaning of "elephant in the room", so decided to look it up.

 

[priberc]

too much drama and virtue signalling for a simple question, so I deleted it. Thanks to the one guy @npalen that actually answered my question.

have fun girls.

yeah no shortage of drama/virtue signalling on here at times. I just saw your question. I use round up here ,not very often and very sparingly. If you have any unanswered questions. I recommend you google it......it what I do when I can't remember the mixing rate. I have round up....I go to Monsantos page. What ever you have go to the manufacturers page. The concentration rates may be different between manufacturers. Good luck