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Top Questions About Knockout Rose Bushes

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Questions About Knockout Rose Bushes

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  • Answered by
    roseman on
    April 29, 2012
    A.

    Be sure that the fertilizer you are using is not too high in nitrogen, as such fertilizers will cause the rosebushes to produce lots of foliage but not many blooms. Also here is a link to an article I wrote on roses not blooming, follow this link >> https://www.gardeningknowhow.com/ornamental/flowers/roses/no-blooms-on-roses.htm
    This should give you some tips on things to do.

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  • Answered by
    roseman on
    April 29, 2012
    A.

    It sounds like it may either have a virus of some sort or something either got sprayed upon the foliage or somehow poured onto the soils around the tree rose. There are some viruses that will cause this sort of thing and unfortunately there is no know cure. If it does not snap out of it soon, I would dig it out along with all the soils in a 20 inch diameter circle around it. Replace the soils with good amended soils and plant a new tree rose. It is sometimes best to get rid of the rose tree effected as soon as possible so as not to risk speading of the problem to the others.

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  • Answered by
    Nikki on
    April 27, 2012
    Certified Expert
    A.

    This article should be of some help to you: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-rust-disease.htm

    Also, our rose specialist normally recommends treating this issue with Green Cure fungicide, as it is both effective and safe to use (do chemicals to worry about).

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  • Answered by
    roseman on
    April 29, 2012
    A.

    Nikki is correct. The article will give you some information and the Green Cure is proven very effective to help with this problem.

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  • Answered by
    roseman on
    April 29, 2012
    A.

    The damage you describe sounds like it could be a form of rose slug, a beetle or perhaps Leaf Hoppers. I would spray the rosesbushes down with a good insecticide. Such as Safer Bug Patrol which should help you gain control. Some tough customers require the use of a systemic insecticide, but I would give the Safer product a try first.

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  • Answered by
    nothis on
    April 28, 2012
    A.

    Not sure what you have, but, would caution you to watch for rust on the leaves. My problem with my Knockouts started the same way and in just a few days time I had rust all over the leaves. It is very noticible on the underside of the leave. I have treated mine with a fungicide but will have to severely cut them back and hope for the best. If you live anywhere near a garden center (not a big box store) take them a sample.

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  • Answered by
    roseman on
    May 5, 2012
    A.

    Wait for them to be done blooming, then go ahead and prune things back. The new growth that comes forth from the pruned back areas will bring with it new blooms. Give them some good rose food and water it in well, rinse down the foliage too, after pruning them back. Don't do the rinseing down during the heat of the day. Best to do all of the above either early in the morning or in the early evening when the temps start to cool down.

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  • Answered by
    Nikki on
    May 11, 2012
    Certified Expert
    A.

    They enjoy moist places, so this is why you are seeing them beneath he mulch. Here is more info that should help: https://www.gardeningknowhow.com/plant-problems/pests/insects/sow-bug-control.htm

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