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New Roses Need Help!

Posted by ML5122 CA (My Page) on
Tue, May 8, 12 at 14:20

I recently had landscaping work done in my yard and planted several carpet roses. They were doing great and now several plants look like they have a fungus or have been severely burned. I used the Miracle Gro garden feeder recently and followed the instructions to spray the leaves and then water the base of the plant.

What is the problem and how do I treat it?

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RE: New Roses Need Help!

If most of the stuff appeared suddenly within a few days of fertilizing, that would be the cause. It might be owing to a measuring error, or the plants were dehydrated at time of spraying. I would water first and spray in the cool of the morning, if high temps are occurring.

However, the roundish spots with purple rings resemble those produced by a disease, rose spot anthracnose, which you can Google. It spreads following rain with cool temperatures. The pale centers of the spots will crumble and fall out, leaving shot-holes with purple rims. Most roses are not susceptible. I don't think it would create the crumpled edges, which could well result from nitrogen (ammonium) toxicity.

RE: New Roses Need Help!

  • Posted by hoovb z9 Southern CA (My Page) on
    Tue, May 8, 12 at 14:42

If you are in So Cal, it's been a bad spring for roses due to the April rain-then-heat weather. Now that the rains appear to be done for the season, the roses should start to grow new foliage and look a lot better. Rose spot anthracnose seems to be the disease of carpet roses here.

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