Ask a Question forum→herbicide ineffectiveness

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Brooks, Alberta
jturuk
May 21, 2020 4:02 PM CST
Hi all


For the last long while it doesn't seem to matter what herbicide I use whether it be Roundup or Killex it just doesn't kill the weeds that are sprayed. They sicken but don't die. I am carefull to make sure that the mixture is correct and I have tried dish soap as a surfactant but no luck. I have tried making it stronger. I have purchased new stuff thinking that maybe the product has a shelf life. Nothing works. It hasn't always been this way. Years ago if you sprayed a weed it died completely. So this is a bit perplexing. Any ideas as to what's going on?

Thanks

John
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BigBill
May 21, 2020 4:12 PM CST
I use Roundup infrequently and it comes already mixed. It has a hose and a nozzle to direct the spray.

The commercial claims aside, weeds with deep tap roots like a thistle or dandelion do not die in one application. They come back from that tap root. You will have to hit them a couple of times.
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DaisyI
May 21, 2020 4:37 PM CST
The weeds are becoming resistant. Spray them two or three times. Plants with waxy coatings can't be killed with roundup.
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ctcarol
May 21, 2020 5:09 PM CST
What Daisy said is correct, but yes, it does have a shelf life too. It works on ACTIVELY GROWING young weeds, and if weather is not ideal for growing, it will require repeat spraying.

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