Please help...something is damaging my roses

vintage_roses(7)April 28, 2011

I have noticed this problem for the past two weeks and it seems to be getting worse. I have been spraying Bayer disease control every week, to build up the immunity, and then I was going to continue with a every two week spraying regimen. I am wondering if this is damage from the spray (it's also been hot hear in the upper 80's), or if this is something else. I have fertilized them, but it was about 2 months ago. I have also notice mole/vole tunnels in my rose beds. Please help! It's much appreciated...

As far as the blooms go, they are all normal, it's the leaves that show damage. New growth hasn't shown any damage so far. The leaves start out with a yellow and the leaves end up turing brown around the edges. This is occurring on most of my roses...

Here are the pictures:

new growth looking healthy

Thanks so much!

Emma G.

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michaelg(7a NC Mts)

Here is a picture showing the "Christmas Tree" pattern of magnesium deficiency. It is interveinal chlorosis with some green remaining between the yellow and the vein itself.

Dr. Malcolm Manners says boron can cause the same symptom if the soil is acid, so a pH check is called for.

Here is a link that might be useful: UF image

    Bookmark   April 28, 2011 at 5:33PM
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michaelg(7a NC Mts)

It is almost surely a nutritional deficiency, probably magnesium if it is on the older rather than new leaves. Magnesium can be supplied by Epsom Salts, 2 TB per plant. However the deficiency can be caused partly by high soil pH or an excess of some other nutrient such as potassium. You might want to get a soil test.

    Bookmark   April 28, 2011 at 6:03PM
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thanks for the quick do I get my soil tested? I will purchase the Epson salt this weekend and will treat the roses right away. Will this deficiency totally kill the rose eventually if left untreated?

    Bookmark   April 28, 2011 at 7:44PM
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michaelg(7a NC Mts)

In most states, inexpensive soil tests are available through the extension service. Look in the phone book, under the county, for "cooperative extension" or "agricultural extension." If you get a test, you can bring the results here.

I doubt it would kill the plants, but affected leaves will not function much, and the symptoms will gradually spread up the cane.

BTW the boron symptom is caused by an excess, not a deficiency, and according to Dr. Manners when pH is below 5.5.

    Bookmark   April 29, 2011 at 10:32AM
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