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Roundup damage to large roses: should I prune? Can I add more roses?

Last Sept, I applied Roundup near 2 large rose plants. I tried to be careful: I got a big box, made a hole in the center of the box base, positioned the box open end down over the area to spray, and sprayed (heavily) through the hole to prevent drift. But 2 months later, I started seeing herbicide damage on the 2 closest roses.

Would it do any good to cut the canes back on those roses at this late date? Or just leave them alone and hope the normal leaves that are left will help the roses recover?

Also, I am planning to buy some more roses to plant (in March) within about 5 feet of the area that was sprayed in Sept. Is that a bad idea? Would I risk killing the new roses by means of roundup travelling through the soil?



Comments (13)

  • 8 years ago

    When it's time to prune in your area cut off anything that is distorted and leave the rest. As for planting, RU dissipates fairly quickly in the soil so by spring when you can plant there should be no problem.

  • 8 years ago

    That's good to know about the Roundup dissipating quickly. At least I won't have to worry about any new roses.

    Cutting off anything that is distorted will probably mean cutting back the entire plant almost to the ground, which I am happy to do if it means the rose might recover. For about half the canes, the old leaves at the end of the canes look ok, but the same canes have thready growth popping out along them further down.

  • 8 years ago

    The following was stated: " As for planting, RU dissipates fairly quickly in the soil so by spring when you can plant there should be no problem."

    H. Kuska comment: Over the winter, the glyphosate may exhibit little decomposition and it may be locked up by chelation to the soil. It is common for rosarians to use a rich organic soil with lots of phosphorus fertilization. Spring application of phosphorus will tend to displace the locked up glyphosate.

    --------------------------------------------------------------------

    "It is generally accepted that glyphosate is deactivated when it reaches the soil and poses little risk to crops. However, recent research has shown that under certain circumstances glyphosate can be remobilized and become plant bioavailable. The circumstances include:

    (1) In the event of phosphorus (P) fertilization, which can compete with glyphosate for binding sites on soil and remobilize bound glyphosate residues (Bott et al., 2011)."

    The above quote is from:

    https://grdc.com.au/Research-and-Development/GRDC-Update-Papers/2016/02/Herbicide-residues-in-soils-are-they-an-issue

    -----------------------------------------------------------

    For some reason the paper linked to below would not allow me to cut and paste (look at the variations in half lives reported).

    http://www.straight-talk.dk/wp-content/uploads/2016/05/DMU-2000-Ecotoxicology-of-Glyphosate.pdf

    ---------------------------------------------------------------------------------

    Please let us know what happens in your specific case.

  • 8 years ago

    Thank you, Henry.

    One thing I forgot to tell you is to water heavily to help dissipate that RU. Another thing is that the plant may, from time to time, still exhibit some signs of damage for quite a while. It can take a long time for all of the effects to disappear.

  • 8 years ago
    last modified: 8 years ago

    Yes, it can take a while. The "park people" sprayed it on my Rose almost a year ago. My Ambridge Rose is still hanging in there, but is the smallest and worst looking of all my roses. We are getting lots of rain now, so I'm thinking this will help. Lisa

  • 8 years ago

    My neighbor got some on my climber and it was putting out distorted growth for a long time. Eventually it stops but the plant may be slow growing for a while. keep watering regularly. Round up is the worst.

  • 8 years ago
    last modified: 8 years ago

    I think there is some bacteria that will help get rid of the chemical they will absorb it and others will eat them. The ameoba and parameciams and protozoa that we learned about in 9th grade.

    Eventually the microbes will ameliorate. I like that word ameliorate the soil.

    It's your garden. Put what you want there. Maybe if you take some good soil from a place that you know grows good plants and sprinkle it on top it will rain down the good microbes. Maybe some good Organic fertilizers at the plant nursery will be good to sprinkle and make the soil good again. Don't they have something called starter fertilizers? To get the good things going again? I think rain eventually takes it away and it dissapates in the air and water and water vapor and the microbes.

  • 8 years ago

    Thanks for all your input, everyone...


    I think I will go ahead and cut everything back just in case there might still be some stuff still sticking to the canes themselves. And then I'll just wait a year and see what happens.


  • 8 years ago

    The following was stated: "But 2 months later, I started seeing herbicide damage on the 2 closest roses."

    H.Kuska question: why do you think " in case there might still be some stuff still sticking to the canes themselves" with the spray precautions that you used and the time before damage appeared?

    What about sprayed plant to its roots, to soil, and then takeup by the roots of the nearby roses. See the section in the following link about this possible mode:

    https://sites.google.com/site/roserosettevirus/home

  • 8 years ago
    last modified: 8 years ago

    Henry Kuska has a good question.

    Why do you think " in case there might still be some stuff still sticking to the canes themselves" with the spray precautions that you used and the time before damage appeared?


  • 8 years ago

    I cut out damaged canes but new ones grew up and showed damage. Roundup goes to the roots and causes problems there too.

  • 8 years ago

    The following was stated earlier in this thread by bart_2015

    "Seriously, people, do NOT USE Roundup!!!!!!!!!!!!! "

    H. Kuska comment:

    See:

    http://www.theecologist.org/News/news_analysis/2988500/roundup_residues_in_food_cause_fatty_liver_disease.html