Roundup???

Anonymous-0 · Jul 19, 2010

Wife brought home a bottle. Mixed it as directed and I sprayed some grass and weeds in the driveway and a couple other places last week. Stuff looks as good or better today as it did when I sprayed.

Does this stuff go bad with time?

Dave

Zachary Hoyt · Jul 19, 2010

Sometimes it takes as much as a week in my experience to kill the
plant, so don't worry yet.
Zach

Anonymous-0 · Jul 19, 2010

Thanks!

Mike (WA) · Jul 19, 2010

Near as I can tell, the gallon I just ran out of was purchased in the late 1970's. Still worked as good at the end as at the beginning.

If your stuff isn't looking sickly after a week, you probably did it right. Death too soon results in less complete kill of the roots, indicating too strong a mix.

INCase · Jul 19, 2010

I haven't had much luck with the watered down stuff from wally-world or similar stores. Have had good luck with generic but mix it strong to kill heavy weeds and poison ivy. Age probably isn't as important as concentration.

Rootsy · Jul 19, 2010

Has it been hot and dry? If so the plants aren't readily absorbing much... Will take longer to get a good kill. Do not mix "light".

I tend to spike my generic glyphosate mixes with 2-4d and a crop oil in a hand sprayer... Generics, depending upon manufacturer, can be lacking on the surfactant quality / level...

Anonymous-0 · Jul 19, 2010

(quoted from post at 12:40:50 07/19/10)
Has it been hot and dry? If so the plants aren't readily absorbing much... Will take longer to get a good kill. Do not mix "light".

...

Very H&D..... Do I need to spray again or just wait it out? Next time should I slip in some dish soap? Or is that just a wives tale?

Dave

Anonymous-0 · Jul 19, 2010

Dont use dish soap, I used dawn on one sprayer load and it made the Round Up not work at all, so I had to spray again, the other loads that I did that day worked great, one before and two after, so it must not work!
Tom

buckyfarmer · Jul 19, 2010

for the quickie I add a few ounces of diesel

james rumph · Jul 19, 2010

I was wondering the same thing, i bought some spayed the weeds twice and they still look fine.

This was over a 10 day period...

Ky Hauler · Jul 19, 2010

I sprayed a mess of grapevines two weeks ago at grandmas and I checked them today and they finally got a good burn down. If it rains to soon it will not take sometimes. It rained hard Saturday night and the vines started to regrow and burned completely the last couple days.

JR.Frye · Jul 19, 2010

HIGH dav2 : I know you will laugh at me and beat me up but that is ok BUD: But I mix round-up and cross-bow together and in about 3 to 4 days you will see a difference and it will not grow back the rest of the year.It will be DEAD:
JR.FRYE

Anonymous-0 · Jul 19, 2010

Anything can go bad with time, if its a liquid. Freeze/thaw causes a lot of problems. I use Roundup Quick Pro dry, it's like sucrose crystals, and lasts forever. If I have a large area to spray, I use the cheap stuff from Agrisupply.com, as long as the A.I.is 41%or better, it will work eventually. Some of the cheaper stuff works better with a non ionic surfactant. Agrisupply probably sells that, too. Like others have said, the target plant has to be actively growing, for it to work.

Heat Houser · Jul 19, 2010

I use ammonium sulfate and Roundup. AKA AMS.
32 oz of Roundup and 2 lbs AMS per acre. A week to 10 days and the weeds will lighten up and then die.

Russ from MN · Jul 19, 2010

I use the 41% and use 2-3 oz per gal, and a little crop oil. Takes at least 2 weeks and sometimes a month to kill everything, then in two months the weeds start coming up again!

ldj · Jul 19, 2010

Mixing a surfactant or AMS makes the plant take up the Roundup, this is good. Mixing 24D, Diesel or other starts the plant dying and it will not take up Roundup as good and complete. You may say I got a kill and perhaps you did or at least think you did. What you are getting is a top kill and the plant will probably come back from roots. This is especially true with plants that have rhizomes. Now for broadleaves you can probably do as good and cheaper with other than Roundup. Now--remember lots of ifs ands & buts. Broadleaves in cotton, you nearly got to use Roundup in roundup ready cotton.

agpilot · Jul 19, 2010

Heat Houser also used ammonium sulfate..
Googled ammonium sulfate and read the wikipedia link and note good comments about using it with roundup...
hope I typed all without mistakes.. or google it yourself.. cheers.. ag
google ammonium sulfate

agpilot · Jul 19, 2010

.. ok, I'll add what wikipedia said..:
It is also used as an agricultural spray adjuvant for water soluble insecticides, herbicides, and fungicides. There it functions to bind iron and calcium cations that are present in both well water and plant cells. It is particularly effective as an adjuvant for 2,4-D (amine), glyphosate, and glufosinate herbicides end.
ag

paul · Jul 19, 2010

The biggest thing AMS does is the equivilent of softening the water. Glyphosate (roundup) will bind with clay particles or water impurities - the hardness in water. The AMS ties up those hardness particles so the glyphosate won't.

Also it makes the weeds you spray grow a bit. It's nitrogen. Growing weeds die better, so this effect is a good thing with the herbicide.

--->Paul

Anonymous-0 · Jul 20, 2010

Just an observation on my part. It seems that when I spray, the plants seem to take forever to die off. Unless that is it rains then they seem to drop like flies. My assumption is it has something to do with the growth of the plant. If it has been dry and the plant is in slow/no grow mode you won't see much in the way of results. Give it some time if it hasn't rained since you sprayed.

Anonymous-0 · Jul 20, 2010

(quoted from post at 07:24:09 07/20/10) Give it some time if it hasn't rained since you sprayed.

Does it make sense to water the area? Hasn't rained since they were sprayed.

Dave

Roundup???

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