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Shelf life of weed killer

Old 08-11-2019, 06:15 AM
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Default Shelf life of weed killer

We did some bushhogging yesterday and getting ready to start spraying food plots

I buy the 41% glyphosate at Tractor Supply and the gallon jug does most of what I need and then I use it around the house


Guy I hunt with has about a half jug of this that is 2 yrs old, do we just mix it little stronger ??? Going to spray food plots at his house one afternoon this week and hate to waste time spraying and realize it did not work as well . He called me last night and asked if I thought this older stuff would be ok to use . Do not see why not but I have never had it sit around this long

I always mix little stronger than recommended anyway
Old 08-11-2019, 06:17 AM
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It’s fine. And over mixing is just wasting chemicals.
Old 08-11-2019, 06:20 AM
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I looked for a "use by" date on the bottle I have , yesterday, because it doesn't seem to be working.
I couldn't find one
Old 08-11-2019, 06:21 AM
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Originally Posted by daughtrylc View Post
it’s fine. And over mixing is just wasting chemicals.
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Old 08-11-2019, 06:25 AM
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Originally Posted by daughtrylc View Post
It’s fine. And over mixing is just wasting chemicals.
does it work quicker if it is stronger?
Old 08-11-2019, 06:30 AM
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Originally Posted by daughtrylc View Post
It’s fine. And over mixing is just wasting chemicals.


I like to mix it a little stronger than recommended since we spray these places and come back couple weeks later and plow and plant . Want to make sure we kill everything especially if there is any “Johnson grass” in food plots. This damn stuff could grow in a desert
Old 08-11-2019, 06:40 AM
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You should be fine....I buy the 2.5 gallon jug of 41% from TS as well, and usually get three years out of one on our 3 acres...... It has continued to work fine, even that long.

It does take almost a week before any results begin to show..
Old 08-11-2019, 06:43 AM
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Originally Posted by billinstuart View Post
does it work quicker if it is stronger?
Not that i have experienced... I have always used 2 oz per gallon and it has worked very good with that strength
Old 08-11-2019, 06:47 AM
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A week to 10 days to see results.
Old 08-11-2019, 06:49 AM
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I have used glyphosate that is at least 4 years old and it seems to work as good as new. If your product doesn't have a surfactant added consider adding a few drops of Dawn or Woolite to a gallon of mix and it will make better contact with the plants you are trying to kill. Add the surfactant after you have mixed your glyphosate, allow enough air space so you can shake or stir things well. If you put the detergent in first, you will get lots of suds when adding the water. Having a product that actually stays in contact with the plant leaves is much minor effective than increasing the concentration above recommended strengths.
Old 08-11-2019, 07:02 AM
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Originally Posted by flcatcher1 View Post
I have used glyphosate that is at least 4 years old and it seems to work as good as new. If your product doesn't have a surfactant added consider adding a few drops of Dawn or Woolite to a gallon of mix and it will make better contact with the plants you are trying to kill. Add the surfactant after you have mixed your glyphosate, allow enough air space so you can shake or stir things well. If you put the detergent in first, you will get lots of suds when adding the water. Having a product that actually stays in contact with the plant leaves is much minor effective than increasing the concentration above recommended strengths.

Thanks, have heard of this “trick” (adding dawn”

I use a 26 gal sprayer on back of my sxs to spray with and it has a boomless sprayer but when spot spraying with the wand around house I can see where this would really help

Will try this when we start spraying
Old 08-11-2019, 07:07 AM
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I do add a little soap..I've noticed many leaves tend to shed liquid water. Stuff like air potatoes have oily leaves.
Old 08-11-2019, 07:24 AM
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You are much better off using a surfactant made for chemicals. (for a neutral PH level, thus effectiveness). Tractor Supply sells it by the gallon.

https://www.tractorsupply.com/tsc/pr...rfactant-1-gal

Also, to avoid over spray, use a marking dye/marking indicator so you can see where you sprayed.
Old 08-11-2019, 07:28 AM
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Originally Posted by flcatcher1 View Post
I have used glyphosate that is at least 4 years old and it seems to work as good as new. If your product doesn't have a surfactant added consider adding a few drops of Dawn or Woolite to a gallon of mix and it will make better contact with the plants you are trying to kill. Add the surfactant after you have mixed your glyphosate, allow enough air space so you can shake or stir things well. If you put the detergent in first, you will get lots of suds when adding the water. Having a product that actually stays in contact with the plant leaves is much minor effective than increasing the concentration above recommended strengths.


/\/\/\/\ THIS 100% /\/\/\/\/\

The smart & common sense is strong with this poster!!! As well as the one directly above my quote. I worked for Orkin on Staten Island for 2 years..
Old 08-11-2019, 07:37 AM
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Originally Posted by tprice View Post




I like to mix it a little stronger than recommended since we spray these places and come back couple weeks later and plow and plant . Want to make sure we kill everything especially if there is any “Johnson grass” in food plots. This damn stuff could grow in a desert
likely using the wrong chemical for what you are spraying. Glyphosate is great, but doesn’t do so good on some plants. If broadcast spraying you need to mixing per the 1,000ft, not just ounces per gallon like you would for spot spraying.

Age doesn’t hurt it, but supposedly freezing
does.

What kind of spray equipment are you using?

just saw you have a boomless broadcast. To determine mix rate you need to know 3 pieces of info.

Ground speed, swath width, and flow rate (measured with a pitcher and stopwatch, not rated flow rate of the pump/heads).
Old 08-11-2019, 08:08 AM
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Originally Posted by autobaun70 View Post


likely using the wrong chemical for what you are spraying. Glyphosate is great, but doesn’t do so good on some plants. If broadcast spraying you need to mixing per the 1,000ft, not just ounces per gallon like you would for spot spraying.

Age doesn’t hurt it, but supposedly freezing
does.

What kind of spray equipment are you using?

just saw you have a boomless broadcast. To determine mix rate you need to know 3 pieces of info.

Ground speed, swath width, and flow rate (measured with a pitcher and stopwatch, not rated flow rate of the pump/heads).
Was talking with a buddy about effectivemess. Seems some crops are genetically modified to be resistant to glyphosate. My mechanical system is a golf cart and a hand held pump sprayer.
Old 08-11-2019, 08:18 AM
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Originally Posted by billinstuart View Post
Was talking with a buddy about effectivemess. Seems some crops are genetically modified to be resistant to glyphosate. My mechanical system is a golf cart and a hand held pump sprayer.
thats been around forever. Corn, soybeans, and quite a few others are mostly bread or GMO to be roundup resistant.

I built a small 4 head sprayer to go on my lawn mower, and we have two more in the farm. Most used is a 25 gallon on the atv with a 10’ boom, then also a bigger one that goes in the 3pt hitch and carries about 150 gallons. I much prefer a boom to a boom less as they are a lot more precise.
Old 08-11-2019, 08:44 AM
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At least we don't have kudzu down here...
Old 08-11-2019, 09:03 AM
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Originally Posted by billinstuart View Post
At least we don't have kudzu down here...
The key word is, YET
Old 08-11-2019, 09:05 AM
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kudzu is easy to get rid of if you stay on top of it.

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