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Hi.

I have quite a few standard roses, mainly Iceberg and I have one Margaret Merrill. We have just built the house and all roses were planted this winter. The Margaret Merrill has terrible black spot. I have been spraying it weekly but it doesn’t seem to be improving and only has about 10 leaves which are all covered in black spot. It has also started to spread to the two closest Icebergs and worry it will continue to spread to all of them. Should I get rid of the Margaret Merrill. I have never had a Margaret Merrill before so not sure if it is just later to bloom than the icebergs which currently all look amazing (besides a few leaves with black spot)and will still come away or it it should be covered in foliage by now? Also is I do get rid of it all together, will the black spot be in the soil and will I need to avoid replanting a rose there?

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Hi Michelle, Iceberg is definitely a stronger grower than Margaret Merrill. In your case I would remove the Margaret Merrill. Blackspot is a fungal disease spread by high humidity and rain drops. Currently you will need to spray with Free flow copper (the finest particle copper available, for the best results) Blackspot can’t be cured you can prevent it from getting established/spreading with the Copper. A good winter clean up spray (copper/oil/Lime sulphur) will help for next year) (mix in some organic seaweed/compost tea or fish fertiliser to keep the Rose healthy with shiny foliage). Thanks the Palmers Team

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