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Chester Co., PA

Has anyone else noticed that Roundup doesn't work anymore? The weed tops get burned but the plant grows back from the roots. They changed the formula earlier this year and advertised results in 24 hours. They have a lot of nerve to call whatever this is by the same name. What does it take, mixing stonger, spraying 2 or 3 times? Anyone got ideas?

9/3/2003 4:21:26 PM

Nova Scotia

when ever i used the product i always bought the concentrate and just mixed it stronger. i like a swift kill with little suffering for the poor weeds.

9/3/2003 4:43:11 PM

Whistler, BC, Canada

Well...the plants become acceptable to the roundup, very fast sometimes...but I find that spraying chemicals just messes up the environment its gonna go crazy one of these days, might not believe me now but you wait...I use sprays myself but very little, and I hate it when I do...Just use your good ole hands to get the weeds out, takes a little more times but you get the roots too...

9/3/2003 4:51:50 PM

Sparta, NC

The reason could be the active ingrediant( glyphosate ) Most of what you buy is about 1/2 strength. If the active ingrediant is abot 20 to 30% it is about half of what regular Roundup is which is 49%. You may just need to double the amount being used.

9/3/2003 5:42:52 PM

it worked on lawn grass for me this year, but I do recall that last year I sprayed it on some moneywart aka creeping jenny aka creeping charlie (an aggressive groundcover) and it didn't affect it at all.

9/3/2003 8:30:40 PM

Sparta, NC

Roundup doesn't work on all grasses and weeds. Also timing is important for a good kill on certain things. I have used it on a lot of different weeds and some it just won't kill no matter how strong you mix it.

9/3/2003 8:42:12 PM

[email protected]

I've sold literally thousands of gallons of Roundup. The formulation change is an honest improvement & in no way compromises the performance. I speak only to the commercial formulations, but most consumer packaging has enjoyed the same benefit.

This isn't a flame, but when I hear that Roundup has failed, my first suspicion is always the applicator. And I'm correct in that assumption about 99.9% of the time. When applied correctly, it is almost impossible to save a succeptible plant even minutes after an accidental hit. All the same, in my field finger pointing isn't a solution. To correct the problem we need some details.

Which formulation is giving you trouble & what weeds are you targetting? When were they sprayed & how large were they? What was the soil moisture at the time of application & did it rain within the hour?

There are always going to be some weeds that any herbicide may have trouble with.

I will also add this little known fact about Glyphosate. It stimulates the germination of many types of seeds. Especially grasses. I have personally treated grass seed by "priming" it in a 2% soaking solution of Roundup to enhance germination. (hard to believe isn't it?) The seed coat is damaged by Roundup. This fascilitates the greater absorbtion of water. Combine this with above average rainfall (in these parts anyway) & what you might be seeing is nothing more than new plant establishment (from existing seeds in the soil) rather than existing weed regrowth.

To increase the length of performance, you might want to try combining Roundup with a Pre-emergence herbicide such as Surflan, Gallery, or Dimension Ultra for true season long control (depending on rate, soil, precipitation, targetted species, timing, length of season, etc, etc).

Steve

9/3/2003 9:51:40 PM

Puyallup, WA

Thanks for the added info, Steve. :>)

9/4/2003 12:08:40 AM

Tipp City, Ohio

Roundup works at its best when sprayed on new and young plants. The older the and more established the plant is, the harder for Roundup to run its course. Poison Ivy, for example, is hard to get rid of if going by the suggested rates. Just increase the strengh and slowly the Ivy will die.

9/4/2003 1:26:36 PM

Montoursville, PA

Worked fine for me in the driveway stone weed bed. Took about the same amount of time the so called older chemical did. Even wacked out some nettles which are reported to be hard to get. They still call for four hours on plant to assure the kill. The more mature the plant is the harder it is to take down. They do not have improved speed as advertised in my opinion.

9/4/2003 10:21:52 PM

[email protected]

Roundup Quickpro Dry is legitimately 24 hour material. Not retail. But not restricted either.

Adding Scythe Herbicide to regular Roundup makes it fast enough to watch the weeds die if the sun is shining on them. Pretty cool. Scythe is also a "reduced risk" pesticide that, like Roundup leaves no soil residue.

Steve

9/5/2003 8:40:57 AM